here is an idea which is encredibly useful. Say you have grouped together a few objects to create a house. But that house is only on one map. What I think would be useful would be to let us save our grouped creations so we can spawn them on other maps. You could make a space ship on the space map, group it, save it, then go into another map, open up objects, scroll down to saved creations, select the ship and boom. You can save yourself thousands of hours just loading up creations you made befor and putting them on newer maps. Who else would want this?
This feature has already been announced.