How would you generally reset the server? Or reset your account on the map?

the spawn points are saved by player names so you would have to change that.
in general i would recommentd to keep the initial first savegame as a backup.

Hrmm... Problem is that you can't change your IGN anymore? Once you log in via .. settings>othersettings.. itll lock your name in.

If i understand correctly, if i delete the save and generate a new map everything will be cool?

Also another question. Is changing another player's team possible?

yes a new map would clear all saved spawn points.
by default every player has a individual team when spawned far/near but after you spawned you can in the "T" menu select to allow new players to join your team and spawn point. these player have then to select your spawn point and not far/near
after a player has spawned there is no way to change his team.

Thanks!