From what i've read/forums i think NB have the code - but one prob with them/anyone releasing it:
"So please respect our copyright and license and do not distribute any of our files"
I guess 2.5 (cracked or not) would be Kye's, and releasing it would be copyright infringment, and would break several intelectual property right laws
Also, if 2.5 was released by anyone other than Kre/SA-MP dev, then i *think* if we (as users) downloaded it then we could be held liable for holding copyrighted work, and breaking laws
(Unsure about this, i may be wrong, lol)
I would prefer sa-mp 1.0, cus of the less lag/bugs, but i would still want the registy and banking system, (if possible)