I just got my power pro 256 and its great.

I'm wondering if there is anyway to independently control the current levels for the DCEN and DCEP portions of the AC waveform while in AC mode, like millers advanced squarewave technology.

For instance, you could Tig weld aluminum in AC mode, and adjust it to 240 amps for the DCEN part of the waveform, and 110 amps for the DCEP part of the waveform, which would allow you to weld 1/4" aluminum with a 3/32" tungsten instead of a 3/16" tungsten. Much less heat, and much more precise arc because of the smaller electrode!

I'm pretty sure the PP256 does not have this feature.

BUT, is it modifiable somehow to have this feature? (I'm an EE)

Maybe you should sell an upgrade kit or something.