Thor,
I have a book called "Fighter" byWerner Held which has 3 pictures of Bf110G-2's of 6 and 7/ZG 76 that are armed with two rocket tubes under each wing. One picture captioned, "Bf 110G-2's....form up to attack the bombers, early 1944"
There is a picture and more info here:
http://www.ww2.dk/air/zerstorer/zg76.htm
and here:
http://en.wikipedia.org/wiki/Zerst%C...rgeschwader_76
where it gives dates for two daylight attacks on bombers, presumably armed with rockets. Both 6&7/ZG 76 were defence of the reich units.