I've never used the M1 button before. I don't even think you could in the DayZ mod. Try using F, or rebind MM3 to your M1 button.

It looks like lots of people are having an issue assigning gear on dedicated servers. http://forums.bistudio.com/showthread.php?167860-Added-Uniform-Disappears-in-Multiplayer

I can also confirm the loadout scripts I have found that worked in ArmA 2 do work fine in ArmA 3 with jips gear working when the server is at persistent = 0; in the server.cfg

~Edit This doesn't work all the time it looks like.

I am not 100% sure what a repo mission is but I can send you a mission with a gear script that worked in ArmA 2 if it helps. Right now I see this is as a huge issue for groups that want to assign custom gear to units without an ammo box.

I agree with this. I also believe that the respawnTemplate EndMission does not work with Tickets (or at all possibly).