It would be convenient to just record any channel, any combo - as with any audio interface. I think the Oade mods correct the display audio bleed. I've never heard of picking up the display after the mod.
Either mod is still an upgrade to the original pres, so it's only a small want to be able to record on CH 3&4 only. For concerts I'll put my NT5 into 1&2(super), then board feed in 3&4(concert). The rest of the time I'll be using ch 1&2 (super) as 2nd system audio for video work with a shotgun, hyper mic, or a wireless unit.