I was just curious if I could make a "blood pool" for vampires that would work similar to the health magicka stamina bar.

I'd like to know too. Skyrim, being the sort of environment it is, could use Hypothermia, Hunger and Dehydration bars to make game-play so much more interesting.

I'd say no for sure and that it's hardcoded, but modders did some incredible things with the UI in Fallout, so I don't know what's possible anymore...

Well Oblivion eventually had status bars you could configure for any variable, but I think it required OBSE and another mod to work. I am hoping Skyrim would allow for a little more out of the box though.

Aren't the HUD elements implemented in scaleform? If so adding new ones should be possible the same way that SkyUI added details to the inventory management.

Of course, getting the data for your bar is another matter. Once SKSE get to bridging the gap between scaleform and papyrus it should be farily simple, but that's not their worklist yet. So that means you'd probably need a SKSE extension to get at the data, and even then it'll probably need SKSE's papyrus interface to access the acutal quest with the script that's driving the value.

Just some random musings, anyway