Fuzzy Finder: Move up/down with vim keys

[heliostatic]

Is your feature request related to a problem? Please describe.

• I also don't know how to scroll to other selections -- j/k don't work given the context.

Describe the solution you'd like

• I'd like to be able to select other matches.

Describe alternatives you've considered
If it's already possible to have multiple key mappings per command, then I can simply do that and map C-j and C-k for this. If not, I guess the solution would be to split out move_up and move_down to read-only lists and "picker" style lists.