Regarding demos, i was thinking the other day:
1-Demos are revealed visually at 10 range by any enemy unit.
2-Demos are not targetable unless a minesweeper is in range.
3-Remove death crit, reduce OTK zone but spread damage.
Demos as booby trap on garrison is fine. Same if use on cover or concealed behind objects. On the other hand, if they are in the middle of the road or in the open...Someone paying attention will avoid them.
Maybe make demos visible at range 10 if not in yellow or green cover, and targetable by anything that can see it. This would help with the worst abuses like demos in the open by a VP.