Backporting mean just backproting. You have to change a bunch of stuff in JBossMQ and even in the startupscript if I remember correctly.
I have made one unofficial backport some month ago. It is a litle bit old but seems to workn quite ok. I works with 2.4.3 (but probably not 2.4.4), but a diff to the current one might show how easy it is to continue this backporting).
I tried this for 2.4.3 and it didn't work. It definitely doesn't work for 2.4.4.