Yes, I would absolutely register again and save your confirmation email. Maybe create a reminder to do this in the beginning of January.
I can't tell you why they don't count 1.95 rentals as it says on the statement. I think it is by design. I don't bother trying as if it was meant to be, they would consider anything where 2 days were charged automatically. I think everyone knows that if you can double dip with both miles and bucks accrual and maybe Star in 2015, it is hard to complain otherwise.
That is my issue with other agencies, I have to pick between free rental days or partner points with usually higher rates. This is a good combo. I am ready to consider another car rental provider if there are ideas out there.
Rasheed