1) the NikeTheBike editor is still stored on the original website. The site is offline, but by using wayback machine, you can still open the link of the "version 24" of the editor. I believe v25 is the latest, but V24 worked ok for me...
WARNING: i take no responsability for eventual pop-up/bugs/viruses while using this link. Always be careful, and scan those old downloads, before opening it...
https://web.archive.org/web/20210830141208/www.svr2010.rr.nu/svredit/svredit_v24.zip
2) i believe the odd CPU bugs are related to the "import moveset" feature. Basically, NikeTheBike editor comes with some custom pre-made moveset that you can import into NoModels to speed up the creation process. Most of them are fine, but some have hacked moves in the wrong place (like a pin instead of a grapple) or other minor bugs, and this lead the CPU to behave in some odd way, sometimes. When i made my other (PSP) version, i imported moveset from the "vanilla" wrestlers only, and the odd behaviours were far less common. So, if you're playing my Ps2 V1.0 and you see a wrestler acting strange (like, for example, Booker T), just go to create-a-moveset and copy the full moveset from another standard wrestler (like R-truth). This should stop the odd behaviour, but unfortunately you have to set his taunt/sig/finishers again...
3) i'm actually looking into a V2 of this mod. Maven (from 06 beta) was the first i've tried and it worked, so now I believe i can also squeeze most of the 09 and 11 roster in (at the cost of the extra characters like Red, Green, doctor etc...).