One of the biggest issues I see people talking about in the forums is the issue of human camping. I would like to explain why I think humans camp.
1. Humans have a symbiotic relationship with their base. Human players need the base to heal, re arm, upgrade weapons, and as defense (in s1 and s2). Especially in s1, a human who leaves the base is instant goon meat. The s1 weapons all have a very low ammo capacity. The chaingun's 300 shots are nothing when you take into account the rate of fire and damage per shot. Humans have to be close to base, because if you run out of ammo to far from base, you are doomed.
The human base is also dependant on a continuous human presence. It requires repairs every time something takes damage, which means a builder is necessary. To defened the builder, players are necessary. The cycle is perpetuated.
2. Aliens are not base dependant. While they need an overmind to function, they do not need to be near it to heal, evolve, and they do not need to re arm at all. They are independant killing machines who are capable of solo work.
The alien base is also not dependant on constant supervision. The base surves two purposes, to allow aliens to spawn, and to protect the overmind. In protecting the overmind alien bases excel. The alien defenses regenerate, which negates the need for a repair person. Humans also rarely attempt to assult the base until at least s2, which gives the aliens plenty of time to build up.
As you can see, there is not one issue that can be fixed to prevent human camping. Everything in tremulous is designed, deliberatly or not, for humans to camp. Humans function better in their base, aliens function better attacking the enemy base. Its a complex problem, and there is not a simple solution, so the next time you complain about base campers, think about what you are really complaining about: The entire system of the humans and the entire system of the aliens, in effect, you are complaining about the nature of the game.