No bears were bothered...
But
I'd like to explain why I insisted (or, "why I didn't like the answers"):
It's simple actually: I never seen all those options on a mouse before. I repeat: NEVER. And did I mention I have a pile of mouses laying around ?
So, by then, either the colleague @pendean did not understand my question, or worse, he gone nuts, making options in his head that simply didn't exist.
Minutes after, Patchy showed that such options DO exist.
In the end, it's down to a regional matter.
Where you guys live, these options are very typical, it seems.
As part of my job, I fix computers (from modest companies up to sophisticated gamers), and never came across those options.
Naturally, for this reason, the provided answers made zero sense to me, and at the same time made perfect sense to you.
None of us was "wrong", if we have to put it that way.