Stuff that works:
Patch Fixture 1 thru 10 1.1
Patch Fixture 1 + 3 + 5 + 7 + 9 at brings up the patch dialog so you can specify the first address of the range of selected fixtures.
If would be really helpful if these also worked:
Patch Fixture 1 thru 10 at 1.1
Patch Fixture 1 + 3 + 5 + 7 + 9 at 1.1
Patch Fixture 1 + 3 + 5 + 7 + 9 1.1