question about middlemouse paste buffer

[Adrian Sud <adrian n sud gmail com>]

Hi,

I'm looking to find out if there is or ever could be a way to configure 
the button that the highlight paste buffer responds to, without forcing 
xinput to misreport button clicks--that is, I'd like mouse button 6 or 7 
to perform the paste action, not button 2, but I still want firefox's 
middle click functionality to be performed on a middle click.

Googling and reading through FAQs showed some methods to swap buttons 
using xinput, but no way to actually change what button press triggers 
this action. Is it hard coded?

Is this an application level thing, or is it in fact triggered by GTK+? 
Can it be changed to use a configurable accelerator such as 
ctrl+v/shift+ins pasting?

Any answers are greatly appreciated, and if my questions are at all 
unclear, let me know.

Thanks,
-Adrian