This has been a long frustration with me. I will be trying to taxi people for an organized event only to have someone merge a commander-less squad left over from another recently ended event with mine instead of leaving their squad then joining mine. This takes up squad space with people who are not doing the event my taxi is for.
I have to go through and kick people who are offline and repeatedly ask people to leave if they are not going to come to the event. I have even seen people who didn't bother to leave the squad and go into story instances.
Please, just give an option for commanders to disallow merging as a checkbox option.
My list of suggestions for GW2
Akkebi | Akkebyyon | Alister Kebi | Akkebi Revi | Occultist Lulu | Shadow Stalker Lulu| Bonebreaker Lulu | Glittermancer | The Mewcifer
Max Masteries | 15.5k AP