Lately I've had alot trouble carrying stuff around, so I suggest adding /enderchest and/or playervaults, Playervaults are like portable chests. You can open them by typing in /pv [number]. The amount of playervaults will increase the higher your rank is. So for example, Premium ranked players will get 1 playervault, Sponsor will get 2, and so on.
Yeah indeed Yeah it might be a little overpowered, but it still is survival. If you'd ever move, you'd wish to have that amount of pvs.