A good approach might be to check whether GM_[gs]etValue are defined, and if not, define them as functions that just set a broad cookie. Something like:

if (!GM_setValue) {
GM_setValue = function(k,v){
// set cookie k=v here
}
}

Disadvantage, of course, is that sites read your cookies. That, and it's ugly.

Since it relies on GM_getValue/GM_setValue, and all GM_ functions are stripped in 0.3.5, there's no way it can work.

In theory, you could store the data in cookies, but I think it would be more of a hassle. Besides, I don't have the time to change the script now -- vacation's calling :)

It's GPL though, so feel free to have a go.