Yeah i'd imagine we need to find better maps, although with 3 maps all doing the same thing, maybe it is a cvar or something on the server
As for the admining, Personally I slay people who throw incend's if they cause damage to anyone, Also, while you probably always do, be sure to use the "!report" function otherwise sometimes RDM will go unnoticed.
As for the other example, it sounds like it was just an accident on the admin's part, If you think you're being unfairly slain, Tell the admins
To type in admin chat, put an @ in front of you message, e.g "@Why am I getting slain!"
The only problem with that, is if an admin says "You're being slain because of this, and that's not going to change" then it would be best to let it go. No one likes hearing arguments (especially Admins hahaha) as it just ends up being spam.
If it keeps happening, where you are slain for unfair reasons, then make a forum post (like you have), and everyone can look into it.
If it's just a one off occurrence, It's for the best to just let it go.