Request: Protected prims

In my sims I would like to be able to have prims on land in the sim that can not be removed by residents and that do not count to local prim pool on a parcel.

This means that I would like to be able to allocate one certain percentage of prims in the sim to one global prim pool available to the sim owner. It would work like one tax where e.g. the prim allocation of all land in the sim is reduced by 5% with those prims becoming available to me as sim admin in an extra prim pool. I would like to be able to adjust the percentage of prims going to that special global pool.

I would then like to use those prims to build infrastructure on land in the sim. Things like trees, waterfalls, roads etc. I would like to build this on land that I sell/deed to residents. I would like those prims to remain, not removable by the land owners and not counting to the parcel's prim pool but to a special global prim pool in the sim.

The same feature could also be useful on some mainland sims to protect Linden created content there.