Firstly I have searched. I'd like to see barrage balloons added over town.

reasons -
It will make NOE base captures more interesting. Putting them at higher variable alts,say 1.5K+ ish, forces the pop much earlier (if you want to destroy them). This give defence a more sporting chance. I would like to see them lethal to both sides and if you destroy one,rather than go boom,they slowly sink to the ground,still presenting a danger.
You therefore have 2 options,pop early and show up on dar,or thread the needle to maintain surprise. You could go even further by having some kind of spotter on board to give advance warning,kinda like having a second functioning dar ring round town to show all enemy cons in range irrespective of alt.
Strange request from a Rolling Thunder squad member,yes. But i like the idea.
EDIT The He-111 had a device to cut the cables i believe.