Create custom licenses as developer license for my item?

Hey guys,

Some developers ask for unlimited license for my codecanyon item. I can sell Extended license as unlimited use?

Not sure I get what you mean by unlimited use, but the main (and only?) difference between the Extended License and the Regular License is that the Extended License allows you to create an end product where the end users need to pay for viewing/using it. Both are limited to one end product per license.