I've always seen the SEH as the equivalent of the MoH or the VC, and didn't like how prevalent they were. (It is not uncommon to roll characters with two or three after a number of terms.) I decided to develop some house rules to cover that, and tried to cover some non-combat awards as well. The following is the Imperial system IMTU:
Starburst for Extreme Heroism (SEH): +9 to decoration roll (1st award), combat assignment required. Second award requires a roll of +12, else ISC below.
Imperial Service Cross (ISC): +6 to decoration roll.
Medal for Conspicuous Gallantry (MCG): +4 to decoration roll, combat assignment required else IMSM.
Imperial Meritorious Service Medal (IMSM): +3 to decoration roll.
Meritorious Conduct Under Fire (MCUF): +2 to decoration roll, combat assignment required else ICM.
Imperial Commendation Medal (ICM): On decoration roll.
Imperial Good Conduct Medal (IGCM): Awarded to long-service enlisted personnel. Roll 9+ once per term starting with term three. DM +1 per term after term three. Not available to any personnel who have rolled a two for decoration, and can only be awarded once.
I like the MT rule (though I am a CT guy) of the technical promotion on mustering out for a recipient of the SEH, and I retain that. For non-Imperial recipients, I change the name to "Legion of Honor" with the planet's name preceding. The promotion remains.
Mercenary XP Points: SEH/4; ISC/3; MCG, IMSM/2; MCUF, ICM, IGCM/1