Damocles Gulf Crusade! Let's see a Tau/Imperium war! pretty please
1.This will not only please the Xenos players, but then the "good guys" could be argued either way. Tau were attacked after allowing disgruntled imperials to peacefully join their empire, while the Imperium is being robbed of its worlds by xenos trickery.
2. In addittion, the tau codex states that it was a meat grinder that no one got really anywhere on, so all the missions could balance themselves out, as far as a campaign goes, and if one side is particularily effective, they could change history.
3. Also, the current campaigns are imperium history based, why not try another race's history?
4. The Damocles Gulf Crusade was ended early due to Behemoth's arrival, so it would also be a great lead-in to the Macragge campaign if you decide to do one afterwards...
5. It is a specific idea to build on
6. It only includes 2 races.... or 3 armies ( Space Marines, Imperial Guard, Tau) so it will be easier to do for 40k
7. Once again, only 2 races, so 3 space fleets for BFG (tau, Imperial navy, space marines)
8. Planetary Empires could be optionally used to portray Dal'yth (the primary stalemate world)
9. BoLS-made tau commanders!
10. Damocles has never really been touched upon.
Those are all the reasons I can come up with now.