Well, the sig images I'm pretty determined to kill/replace with avatar images. I can't see much redeeming value in letting users put images in signatures across the entire site. Profiles I'm still 50/50 on. I may wind up just writing some resizing code for those, but I'm not sure if it's worth the effort. Large graphic profiles are inherently kind of stupid as then readers have to scroll down to see every comic as they read your comics. I don't get why anyone would want that.
What are the chances of people having a personal page somewhere on the site, or maybe a spruced up info page where we can customize it a bit (different background colours, layout, etc...)? That way people can have large images and as much profile information as they like (within whatever size limit you set), but it won't annoy anyone unless they choose to go in and look at it. This would also be great to have a couple of templates to customize the look of the pages as well (just a suggestion.)
I realize that the Home feature can be used to do the same thing, but I think people are more likely to look at an info page hosted within stripcreator (and about stripcreator) than get linked over to another site that could contain anything.
Dinosaurs had eggs bro, the chicken came way later.