I understand what you want it to do, I'm just explaining that's not how it would work. That's just not what the || operator does.
You would need an entirely new operator for that, something that basically created an implicit list. But in that case it's better not to use an operator at all, instead it would make more sense to have mIRC support lists in general (in the same way it supports hash tables) and then to use an identifier to check if x is contained in that list.
Or, as I explained in my response to hixxy's second post, you can use the existing method of tokens and $istok().
