Tet: What are you trying to do? Sledge still has a few bugs, but 99% of major fetures should behave exactly like hammer.
One bug I notice has to do with editing a group and/or entity and Ignore Groups toggled. For example, shift+cloning only a portion of a group will meet with some strange results. (I recommend "to-worlding" a func_wall and ungrouping, before doing any cloning, Unless PB ninja-fixed it today
Atom: I was just about to submit my entry unfinished, but if you are saying we have the whole day of the 19th, I will keep working on it! (I vastly overestimated my ability to finish off the map at the last minute!)
Zeeba: I never tried to do that in GS before, sorry you couldn't get it to work