More players in survival mode.

Why do i want this added? As there are only FIVE players that can join in survival mode, I would want as many as creative can have, Why? Because i play with my in real life friend and my brother(2.) Followed by one of my other friend that plays with me.(3.) Anyways i would think it would be a great idea so others players can join ur server (Survival.) And rate your world. So it could be featured!
(Without turning cheats on.)
2: what would happen if you did this?
I realized people can grief severs, So the Host of the sever and the other ops,(Operators) Can make it where they can't, For example. They can't use: tnt, Flint'n still, Nether star, Etc, Without the host or the operator's permisson. I don't know if thats already a option, I don't think so because its it's nowhere, I don't know, I might been over looking.