This is the goal of a game I am gonna start over the weekend. Either a Karling -> Germany or a Saxon Germany. Raise a powerful German state, defend Rome from heathens, take the holy lands, pacify the Slavic pagans, throw back the mongols... lots to do!
That extra 200 years adds so much depth to a single campaign it's staggering.
slightly related note... the AI formed the HRE in an observer game I let run last night while I was busy with other things. That's the first time i've seen that, and they became a pretty scary force. They'd united Lotharingia, East Francia and Italy beneath its command just as the Age of the Crusader began.
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