I suggest that you take a look at your priorities, and move this to the top of the list (heartsurgery or not). Does anyone record in 16-bit anymore? I haven’t done so for over a decade!
It’s a great pity that an excellent product like Cubasis is rendered useless by this flaw. This is a showstopper for me, and I won’t touch it until you solve this major flaw. I can assure you that you are loosing a lot of sales, while your customers are sitting around, waiting (and getting annoyed)!