replace variables in style with xml

[create365]

You don't understand me.

I am writing a product.

To install it, I need to modify existing vBulletin template. The only way so far I know, was to use vBulletin template hooks and/or plugins system.

My question is, is it possible to modify existing vBulletin template - FORUMHOME, to insert custom code inside?

I know I can include whole forumhome template in the script and replace it, but if somebody edited it manually those changes will be lost.

EDIT: Yes, that's what I'm looking for more-less. So this is a plugin, there is no way to do that on "vanilla" vB?