Those aren't negatives, we can make the leader select members from his gang (normal selection period).

Negatives :

• Time zones for several players trying to play with their teams, and would take twice the time for a staff member to know how to add him back to the list.
• Staff monitoring, this will not be as easy as you think, as we have 3/4 working and the others are either helping players or afk, remember this is going to take long so this won't positively work for a single staff member to watch and detain a 6 x 6 gmap level or somewhat. (+ I had to go off while being in the semi-finals and gave the relay to layerd, he was on his iOS device so it's really hard monitoring the players, for example)
• Graal bugs, the invisible trap thing was a graal bug, so are invisible players in a gmap, we can't fix that at all.
• Sign-up forms will be pushed and the first 64 forms will be sent at within the first hour, which gives a disadvantage at the opposing time zone player.
• @ The rules that says 'There is no sub gang', out of 64, I don't think a staff is going to analyze the leader of each gang 4096 times, and will compare it to the main account he has, having it as 16 was already hard enough.

Some of these are quite right, we know the GST turned up bad for several reasons, as we're trying to fix it for the next one. But suggesting such ideas are probably going to a bad frame.
I can look into some positive ones and implement them on the next GST hopefully.

tl;dr If this GST is going to be similar like Classic's, you obviously didn't know that the majority of her players comes on at one timezone. (they have 1700 players at night, and 700 at morning for me)