The new group management and land management tools were very useful, especially the facility to set land to be no-build and grant an exemption to trusted people via a group permission.
There are several LSL functions that require the object the calling script is in to be group-deeded. llEjectFromLand being a prime example. But to rez child prims, the object must be owned by an avatar that has a role exempting them from the land no-build option.
There is no way to assign that role to a group-deeded object. So it's impossible to use the group management to eliminate a sizable number of griefers, and to have a group-deeded object that you want to rez children work.
I propose that the group-deeding option in the Object Editor permit the selection of at least a role, perhaps 1 or more roles. These should be modifyable via the object editor at a later date also.