Hi, that was a good question
This is so tricky problem, than I think I must use radiochannelÂ's anyway. But actual answer is following...
I want to add little bit more realism to mission and more role to RTO guy in coop. Leader and guy with the radio could be in huge distance from each otherÂ's. And it seems funny that group leader can use radio even he is far away from it. Well, I know - group can communicate anyway each otherÂ's even if they are in different sideÂ's of map. And I can make leader distance to radioguy trigger to show radiocommandÂ's only in leader<->RTO near from each others... so no problem anymore about radio on second thought. You are right about that.
...BUT! :-X
I still wonder same question (not becouse of radio anymore), but for other things to do in coop missions. For example. I have truck in this same mission, and itÂ's long journey. I add action"Radio on" to truck, so playerÂ's can choose that do they need some entairment for a ride. If they hate that song they can put radio off (nothing is more annoying than crappy music in game and you canÂ't make all happy, so I think its only fair to get some options to players about it). Okay, here is problem. I KNOW that if everyone in group can put radio on or off, it could be like on-off-on-off-on-off... so I want to get that option only for driver (itÂ's army, not demochraty ;D), so other players may ask him to turn radio on or off. But again - same problem. Nearby unitÂ's can use driverÂ's actionÂ's.
So still... if anyone knowÂ's how to make players actions for private use only please give me some advise. Is this even possible? I think itÂ's things like "good to know" for many mission makers who add actions to multiplayer missions.