yea an option to upload an image could be added in
User Profile Fields, then a mod of some sort could use that image I suppose. yea that may be able to be done
and as far as expanding the char allowing the name User Name allows may also be able to be edited , but Im to tired to play with it tonight

it might be in general settings were you give that amount to be used if its expanded there it would allow more chars in the user control area like to 255 i would think. not even sure as i have never tried it .
User Registration Options yea default is 25 chars in Maximum Username Length