Mine is blanked and the eml is on but i just leave it on! I check the codes every week to make sure that there is no other codes that have come up but other than that, i just leave it on.
You can reset it, but it will come back on again after about 100 miles!
Obviously it will need turning off for mot!
I would just blank it off, makes it a totally different car!
I asked a re-mapper about disabling the EGR while doing the remap but he said he would only do that if the DPF was removed or "gutted" as not doing that would "kill" the DPF.