Oh yes. Do this gear upgrade. Do it now.
I pulled my motor apart (YouTube guides everywhere) fairly easily.
I removed the grease the steel gear came packed in and used my own high-quality grease instead. I don't think there's anything wrong with the grease used by Luna but, it's an unknown so I used me own.
After greasing everything in the motor with moving/rubbing parts and putting the motor back on the bike I expected a noisy ride but the motor is actually quieter now than it was with the nylon. YMMV of course.
No more worrying about over-heating my nylon gear with long power applications like a commute.