This is a feature that Live has and it is pretty useful.
The idea would be to have a save type (a la dsp chain, theme, sample) of Pattern Block which would save the contents of the selected block into a renoise-readable xml at the desired location with a user-specified filename. That way if, say, I could have a library of favorite drum patterns and drop them in when I want.
Maybe when it was imported it would automatically take on the selected instrument?
EXTRA CREDIT: It would be double sweet if this could save the pattern block’s referenced instruments alongside it in some kind of zip or something so that when you brought a pattern back in it also brought in its referenced instruments.
That sounds like a lot of work, though… maybe for 3.0?