1) First and foremost, change the teleport of the Key to the Lair to automatically opening a portal by the lair.
On a side note, I just wasted 2 lair keys today because the server crashed and because of "player error" all because I died even though I had a tp by the lair but my teammates did not, and I want to say I am not happy about that even if I get 1 key back for the server crash.
2) Andariel should be given a chance (aside from in general) to drop the trag mark just like Duriel can drop the mark of lies and Diablo can drop the mark of sin.
3) Let the DL bosses or just Cthulhu have a chance to drop Ctoggha's box.
4) Let the Uldryssian have a chance to drop the Key of Justice.
5) Allow Caches to give you all its contents even if you open it at the lair as a reward for those players that farm DL.