Hi,
I have three suggestions for making game setup quicker.
1) when people choose teams and positions this is represented on the map preview- ie if three people from team a are on position 5 there are three A's displayed next to that position on the preview- maybe "stuck" to the number. I think this would be useful even if the numbers are really small.
2) have an option so that the host can disable team-position combinations that are wrong for that game- so if it is north versus south with two teams, a and b are limited to selecting only the appropriate positions to allow that.
3)have a host option to say that players can't share a position- so they only have what is left available to them.
I hope these are useful/ make sense!