Two things which seem to be bugs:

1. temple key doesn't seem to be necessary if someone has opened the door on a previous run through the quest. The door should be re-locked as part of the quest init script.

2. temple key isn't stripped on quest completion. Not a biggy, but something which might be added if time is available.

Oh...

3. trap by a chest seems to not respawn if removed/triggered by a previous group (not confirmed)

*edit* reference: Tigereye Chosen in the sewers quest, not Sewertown.

I think your post makes it clear that you misunderstand the purpose of the Temple Key -- you don't get it at the start, you get it at some point during the course of the quest, and its purpose is unrelated to the area you find it in.

None of our traps respawn yet, our trap respawning code isn't done at this time.

Thanks for the report though.