Thanks for your review! Of course all the others as well!
The reason why there is no Joomla 1.5 version, is that J1.5 is almost end-of-life. It would take a lot of time to make the extension compatible with J1.5. In my opinion wasted time, since J1.5 websites needs to be migrated soon anyway. Beside that, the most extension developers will drop support for J1.5 soon or already did that.
I will use this time to further improve Cookie Confirm, so you could all benefit from it.