I've just discovered that my keybindings work inside search boxes, edit boxes, etc.! So far this feels very natural and it seems very useful!
Sublime Text is full of small details that keep surprising me over and over again. This is great!
However, there may be a small glitch with this feature when you are filtering a list control:
For me, /jj/ activates commandMode, but if I press this key combo inside a filter box for a list control the filter becomes empty. I guess this is because ST's trying to find xxx + "j" or xxx + "jj" and can't find any match (although those extra characters don't appear in the filter box at any time). Deleting or adding characters after that gives you back the expected set of matching strings.
It's a tiny annoyance, but I thought I'd mention it.