1.mmses cant run on 8 gig sticks from what i understand so thats kinda bogus.follow my guide 1st link in my signature to help you get cfw easy,and cheap.
2.yes you can as it doesnt rewrite the stick.it just adds files for the psp to recognize.
3.psp games can be as low as a couple hundred megs or so and run to close to 2 gigs(umd capacity)
4.never tried the led battery so i wouldnt be able to say.again refer to my guide,or you can also by a pandora from dealextreme.com
5.not nessecarily but i find micro sdhcs to be faster with adapters.again refer to my signature(2nd link) for info on that.
6.as far as making it custom firmware,not really.as far as anything else goes,perhaps.the psp scene and all its homebrew glory is very massive.
need any further help,feel free to ask!
