Here is some good info on the various editions throughout it's history. At the very least it might be helpful to get tags to distinguish between the Rolemaster Standard System or RMSS and Rolemaster Fantasy Roleplaying or RMFRP, since these were the most popular versions.
As of right now, the Editions are:
- Rolemaster First Edition or RM1
- Rolemaster Second Edition or RM2
- Rolemaster Standard System or RMSS
- Rolemaster Fantasy Roleplaying or RMFRP
- Rolemaster Classic or RMC (an update of RM2)
- Rolemaster Express or RMX (a rules lite version of RMC)
- Unified Rolemaster
I would be happy to write up the tag info as needed.