I don't think anyone other than you is saying it would be a nice feature. I think everyone is saying it should not be a feature. And as I stated, if it was something that people wanted, then it's not the place of each application to implement it. It's the place of mouse manufacturers and/or OS developers.
For your numbered list... 1) No, we don't. 2) Not even sure what you're trying to say here. 3) That's the opposite of what's said... if there are a lot of different variants that people might want, then scripting it (this includes using DLLs, which was suggested) is preferable to a built-in setting. 4) Who said this? 5) No. mIRC shouldn't be breaking standards.
In short, your numbered list makes little sense. It's as if you took what people said and tried your best to twist it into what you wanted.
