Catergorizing photos iPhone 4

Ive noticed that there isnt a feature that does this, its the simplest thing to do yet its not an option. I want to be able to pick which folder to store a pic in when i save one from email, mms, etc. Is this a feature for a future iOS update? If not, can I suggest this to apple somehwere? Thanks,
MacBook Mac OS X (10.6.4) iPhone 4, iPod 30GB, iPad 2 (Once it gets released)