Somebody...

[DeclanWhite]

...make an impulse loading pedal that is simple/cheap enough to be sold cheaply and make lots of money.

i know i'd buy one.

 

[DeclanWhite]

or even just line 6 needs to implement it into POD. then they will sell like hotcakes

 

[ahjteam]

Freeverb3 is an open source reverb with impulse loader, you could use that as basis for it.

http://freeverb3.sourceforge.net