You just have to adjust the key map so features that don't need LEDs are on the the top 3 keys... Paging, Voicemail, System or Station Speed dial, or whatever doesn't require a light.
But don't feel bad, when I learned this I had about 120 deployed across 2 sites on an overnight cut-over. Left at 4am and wasn't coming back til noon but I got a call from the trainer and had to come back at 8am because "all these phones are broken" and I called support. Probably one of the shortest and dumbest calls I ever made to support. That's how I learned about it. Fix was a quick edit of a couple key maps, thank goodness for self-labeling keys.
According to our regional Mitel sales person, they will get "more than one page of keys" soon... The way he talked I expected it in the 6.2 release but didn't see it in the release notes.
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