(edited by Virtuality.8351)
Hostile Takeover in LFG by 'Merge' Function
I’m not sure I’ve specifically encountered the reasons you mention, but agree the merge groups needs options to prevent it. As too many times some random will merge groups from different map metas no reason (no idea if people do it troll or just by accident), which gets really messy & disruptive for the comm who then has to sort his/her squad back out, and kick those who are doing the meta in the other map that merged, to free up squad space again.
I have no idea why it’s been designed so any random in a squad can merge groups. It should be limited to comms only, and even then it should send a request to the comm of the other group who would then have the option of agreeing weather to accept the merge or not.
Your idea of also an option for the comm to set the group to un-mergeable would also be good.