Adding my vote.
Based on the description of the block size, it seems like Poweramp EQ is already using convolution under the covers anyway, so hopefully it wouldn't be too terribly difficult to implement a very basic version of this feature. I expect the hardest part would be designing/implementing the UI for it.
It might be necessary to bundle multiple sample rates of convolution files together as a set for users who don't stick to a single sample rate for whatever reason. Or at least provide the ability to resample the convolution like JamesDSP does.
