We are not sure what tribes log on or off as there is no way to track them. Unfortunately there is also no way to identify where spawn points are on the map so that tribes avoid building on them. The spawn timers are set as is for a reason. This is a Family Friendly server so it is set up for both hard core or casual players. Real life comes first so it would be unfair to destroy some tribes stuff just to find out they had a death in the family and were unable to play for weeks just to finally log in and find all their stuff gone. So in short, we designed the timers for a reason and for now they will stay as is.