1.) That was changed.
2.) High Q fur endgame.
3.) You still get the buffs.
4.) You dont have to equally develope them but the FEP needed to raise any skill is determined by the highest skill. So if you WANT balanced stats it is easier if you keep them all close.
5.) It is Ender. Open map under ground and click the pink eyeglass.
6.) Locks on all gates, unless you want a random to come by and put locks on locking you out.
7.) dont know.