Ever since I got my first Virus TI Keyboard in 2007, I've noticed that the 1/2 and 1/4 delay are exactly the same, I also have a TI2 Desktop and the issue is exactly the same, also, 2 of my friends have Virus TI's as well and they report the same problem.
I've waited 3 years for this to be fixed, no such luck, so I thought I'd mention it
SJR