Well i have 2 ideas of my own that i don't believe would be too awfully hard to code...although i've never scripted anything..only played around with some stuff.
1st idea is to allow you to see the health of the enemy players while your waiting to respawn. i always hate it when i'm in a fire fight with someone and they kill me and i have no idea how much damage i did to them.
2nd is a map idea. its kinda like a combination of Blox and Airpirates. Have a Hold The Flag or a CTF map or even a TDM or DM map thats really high in the air and its a series of connected pipes with multiple levels that you can run on but it has a couple holes in it that you can fall through and you will either fall down a level or if your unlucky, fall through the wrong hole and fall to your death.