diff --git a/cmd/cli/run_scenario.go b/cmd/cli/run_scenario.go
index eee8d1b0..a5bde8b6 100644
--- a/cmd/cli/run_scenario.go
+++ b/cmd/cli/run_scenario.go
@@ -78,7 +78,7 @@ func (r *scenarioRunConfig) addCLIFlags(fs *pflag.FlagSet) {
 	fs.DurationVar(&r.timeout, "timeout", 0, "If set, the scenario will stop after this amount of"+
 		" time has elapsed. Any still-running iterations will be cancelled, and omes will exit nonzero.")
 	fs.IntVar(&r.maxConcurrent, "max-concurrent", 0, "Override max-concurrent for the scenario")
-	fs.StringSliceVar(&r.scenarioOptions, "option", nil, "Additional options for the scenario, in key=value format")
+	fs.StringArrayVar(&r.scenarioOptions, "option", nil, "Additional options for the scenario, in key=value format")
 	fs.BoolVar(&r.doNotRegisterSearchAttributes, "do-not-register-search-attributes", false,
 		"Do not register the default search attributes used by scenarios. "+
 			"If the search attributes are not registed by the scenario they must be registered through some other method")
diff --git a/loadgen/helper_sleepactivity.go b/loadgen/helper_sleepactivity.go
index b2efed78..cbfb42c0 100644
--- a/loadgen/helper_sleepactivity.go
+++ b/loadgen/helper_sleepactivity.go
@@ -39,7 +39,7 @@ type SleepActivityGroupConfig struct {
 	FairnessWeight *DistributionField[float32] `json:"fairnessWeight"`
 }
 
-func ParseAndValidateSleepActivityConfig(jsonStr string, requireCount bool) (*SleepActivityConfig, error) {
+func ParseAndValidateSleepActivityConfig(jsonStr string, requireCount, requireSleepDuration bool) (*SleepActivityConfig, error) {
 	if jsonStr == "" {
 		return nil, nil
 	}
@@ -57,7 +57,7 @@ func ParseAndValidateSleepActivityConfig(jsonStr string, requireCount bool) (*Sl
 		if groupConfig.Weight < 0 {
 			return nil, fmt.Errorf("SleepActivityGroupConfig: Group '%s' Weight must be non-negative", groupID)
 		}
-		if groupConfig.SleepDuration == nil {
+		if requireSleepDuration && groupConfig.SleepDuration == nil {
 			return nil, fmt.Errorf("SleepActivityGroupConfig: Group '%s' SleepDuration field is required", groupID)
 		}
 	}
diff --git a/scenarios/ebb_and_flow.go b/scenarios/ebb_and_flow.go
index 35067911..aa6beafb 100644
--- a/scenarios/ebb_and_flow.go
+++ b/scenarios/ebb_and_flow.go
@@ -121,8 +121,8 @@ func (e *ebbAndFlowExecutor) Configure(info loadgen.ScenarioInfo) error {
 
 	if sleepActivitiesStr, ok := info.ScenarioOptions[SleepActivityJsonFlag]; ok {
 		var err error
-		// This scenario overrides "count" so do not require it.
-		config.SleepActivityConfig, err = loadgen.ParseAndValidateSleepActivityConfig(sleepActivitiesStr, false)
+		// This scenario overrides "count" and "sleepDuration" so do not require them.
+		config.SleepActivityConfig, err = loadgen.ParseAndValidateSleepActivityConfig(sleepActivitiesStr, false, false)
 		if err != nil {
 			return fmt.Errorf("invalid %s: %w", SleepActivityJsonFlag, err)
 		}
@@ -185,7 +185,7 @@ func (e *ebbAndFlowExecutor) Run(ctx context.Context, info loadgen.ScenarioInfo)
 	e.Logger.Infof("Starting ebb and flow scenario: min_backlog=%d, max_backlog=%d, period=%v, duration=%v",
 		config.MinBacklog, config.MaxBacklog, config.Period, e.Configuration.Duration)
 
-	var started, completed, backlog, target, rate int64
+	var started, completed, backlog, target, activities int64
 
 	for elapsed := time.Duration(0); elapsed < e.Configuration.Duration; elapsed = time.Since(e.startTime) {
 		select {
@@ -207,20 +207,20 @@ func (e *ebbAndFlowExecutor) Run(ctx context.Context, info loadgen.ScenarioInfo)
 			backlog = started - completed
 
 			target = calculateBacklogTarget(elapsed, config.Period, config.MinBacklog, config.MaxBacklog)
-			activities := target - backlog
+			activities = target - backlog
 			activities = max(activities, 0)
 			activities = min(activities, config.MaxRate)
 			if activities > 0 {
 				startWG.Add(1)
-				go func(iter, rate int64) {
+				go func(iter, activities int64) {
 					defer startWG.Done()
 					errCh <- e.spawnWorkflowWithActivities(ctx, iter, activities, config.SleepActivityConfig)
-				}(iter, rate)
+				}(iter, activities)
 				iter++
 			}
 		case <-backlogTicker.C:
-			e.Logger.Debugf("Backlog: %d, target: %d, rate: %d/s, started: %d, completed: %d",
-				backlog, target, rate, started, completed)
+			e.Logger.Debugf("Backlog: %d, target: %d, last iter: %d, started: %d, completed: %d",
+				backlog, target, activities, started, completed)
 		}
 	}
 
diff --git a/scenarios/throughput_stress.go b/scenarios/throughput_stress.go
index f93829f1..b73ca13d 100644
--- a/scenarios/throughput_stress.go
+++ b/scenarios/throughput_stress.go
@@ -150,7 +150,7 @@ func (t *tpsExecutor) Configure(info loadgen.ScenarioInfo) error {
 
 	if sleepActivitiesStr, ok := info.ScenarioOptions[SleepActivityJsonFlag]; ok {
 		var err error
-		config.SleepActivities, err = loadgen.ParseAndValidateSleepActivityConfig(sleepActivitiesStr, true)
+		config.SleepActivities, err = loadgen.ParseAndValidateSleepActivityConfig(sleepActivitiesStr, true, true)
 		if err != nil {
 			return fmt.Errorf("invalid %s: %w", SleepActivityJsonFlag, err)
 		}