As example a Player/Team raiding a Base and another player wants to disturb them, is it posible to make that the raid is locked for the Raider and the other Random Player cant go into the Zone? 

2. Question:
When 3 Bases spawing and a Player starts raiding one Base the other 2 Bases despawn instantly,  someone know how to fix that? That the Bases still stay and can be raided

this is in the documentation, Lock Treasure To First Attacker

as for despawning idk. need more info as bases don't despawn until they're looted or tc is destroyed if that option is enabled