It’s not really a heavy bug, but it’s annoying anyhow.
you can not drag the mouse when creating a vraysun. if you want to place another lightsource you can drag the viewport to the right location.
I don’t know if this was reported yet.
No, but it should be relatively easy to fix; thanks for the pointer.
Best regards,
Vlado
hm, I noticed it doesn’t work in SP2 either. 
best regards
themaxxer