Repetitive flight plans don't exist in the part of the world I think you're referring to. The information you mention is included in the filed flight plan but it might not be available to the people in the tower - or maybe they just need to reconfirm it.
I've seen RPL's here. I sort of understand they ask for registration since I haven't seen that information on the RPL, but it's the POD part that has got me thinking.
BTW, why is it necessary for ATC to know the registration of an airplane operating regular scheduled flights? Maybe just in case things go south?
Best regards
Escape Path