Squad spacing controls
Certain squads just insist on bunching up insanely tight. This is particularly the case with expensive 4-man squads, such as panzergrenadiers. Considering that panzergrenadiers can be made even more expensive with a 120 munition panzerschrek upgrade, their lack of spacing is pretty infuriating. A single tank shell is sometimes all it takes to destroy a huge investment when they're supposed to be a counter to tanks.
Suggestion: Add a button or two that allows you to cycle through squad spacing sizes(for all squad types) or perhaps even change formation. The mouse wheel strikes me as ideal, but obviously that has an existing use.
On a similar note, Relic could stand to drastically reduce the current distance value that 'snaps' infantry to positions in cover. I don't know why it was introduced and I find it to be a significant impediment to good micro.
Any time a unit is stationary the models should seek cover, the moment the unit moves it should spread out. Simple.
But if you wanted to get fancy:
Make the default stance "cover-seeking"
Add a hotkey that toggles the unit to spread formation
Double-tapping the hotkey makes the unit quickly scatter to dodge grenades
1-3 second cool-down on the double-tap to stop shenanigans