I would suggest an RMU supplement, maybe simply called "Future Law" if we're still following those naming conventions, that adds sci-fi elements to Rolemaster. This would include technical skills and professions, psionic powers, energy weapons, that sort. It should have a chapter on adapting either Spacemaster setting to the new rules — that way people still using the Terran Star Empire can bring it up to speed, and the Privateers setting would benefit from consolidated rules.
In the same vein, we could have a 'modern' supplement that covers firearms, modern-day skills, etc.
I still hope, someday, to see a Privateers book (even if it's only in PDF) that adds more detail to the setting itself. The star map I uploaded to the Vault is woefully incomplete.