1. vBSEO is known to work with all vBulletin modifications released to date, if you have a custom mod created, then it should be that programmer who should program around vBSEO.
2. Do you go and fix vBulletins security flaws by manually updating every file? Didnt think you did. Simply upload the new version they release, and problem solved.
3. The same can be true for searching for vBulletin, and any other peice of web software
4. Not really, especially that since that link as the rel="nofollow" atribute to it.
There are currently two known SEO hacks here, vRewrite which is limited in options, doesnt receive much support and has known bugs. Then there was just one released recently called Zoints SEO which i havent followed or tried so i can not comment.
Good luck on your search for a free modification with half the features of vBSEO, let alone all of them.
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