In all the time I've spent flatting, I'd never once considered how much friggin' easier my life would have been if I'd just separated each section with a line! I'd been lassoing each shape all this time. *head-desk* You've just made my job MUCH simpler, thanks!
Any particular reason why you don't save selections in Channels? I think that would make things a lot easier in case you have to go back and re-colour something. It means you wouldn't have to keep re-lasso-ing.
Ya don't have to relasso with flats. You put yer flats on a seperate layer or channel. Then you just use the magic wand to grab the area you're gonna color. Do alla yer coloring on a seperate layer or in the RGB/CMYK channel. If you need to fix something later, you just go back to yer flats layer/channel, grab the problem area with the wand, then go back and recolor.
Hehe, it's easy to get a super-secret stash. Just send em a polite note asking for some hi rez files. I've found that 99% of the pencillers and inkers here on DA have no problem sending you artwork when ya ask em nicely. Even the extremely busy guys.