You can set your KeyCommand to Nudge Value ...so grid increments aren't that useful. Ticks would be great if holding down the key would repeat clicks. I've opted for now for half-frames which seem to give 20 ticks per click @ 120 bpm.
I think the Nudge Value setting serves what you require. Instead of chosing the value from the list you can also set the Nudge Value on the fly. For me this is too complicated but the functions are here. Just open the KeyCommands window, type "nudge" into the search field and look at the options.Even with click-recorded material, nuances of phrasing and synching with human players requires a more flexible nudge protocol.