Yeah. I do this in my IR translations using the Hijack kernel. For my pioneer remote, this looks like this in the ir_translate section of config.ini:

0ad520a=Vol-,Vol-,Vol-,Vol-,Vol-
0ad520b=Vol+,Vol+,Vol+,Vol+,Vol+

So each press of my volume up/down on my Pioneer remote sends 5 volume up or down commands to the player. Works for me.