Thanks for the bug reports Moo, they're always helpful.
1) I added something to Trac for this.
Incidentally, are we happy with the current scoring system for Deathmatch? I was basically copying other FPS type games, so you get +1 for killing another knight, and -1 for a "suicide". For monsters I wasn't sure what to do, so I just said you get zero points if a monster kills you. It's all a bit arbitrary, but it seems to work OK

2) Agreed.
3) Bug. Probably related to #100 (which is: if another knight teleports away from your current room, then the teleport sound is only heard by one of the two knights). I think the bug is that sounds are only played in one room at a time, so if a sound is audible in two different rooms, it will only be heard in one of them at the moment.
4) & 5) I like these ideas. Indeed, it would be nice if I could keep adding new quest types (maybe one every 2-3 months?) as it would keep the game interesting and give players a reason to keep coming back. (Time permitting, of course...)
Someone suggested a "zombie survival" mode a while back, which was basically that the dungeon would be filled with zombies and you had to fight your way to the centre. I did make a quick prototype at the time, but it wasn't much fun because the zombies don't really provide that much of a challenge. (You can basically just stand in a doorway and take them out one by one.) However, if you had to kill a certain number within a time limit, that might be more interesting...
The "explore 100% of map" one sounds quite interesting too. Would probably be quite easy to program, as well.
Please keep quest ideas coming

6) That's because I moved the server from a VPS to a home server. (There was an old blog post about it a while back.) This was to cut down on hosting costs. Unfortunately it means the wrong host name shows up, I could fix that but it didn't seem important at the time.
7) Yes, you're probably right -- the pentagram has to be "hittable" for the destroy book with wand quest to work. Sounds like another special case is needed (sigh...)