No wireless remote flash with IR remote on 3 second pause?!?

Anyone have any idea why the K10D is allowed to use a mix of wireless flash and the wireless remote with 0 second pause, but with the three second pause mode, the wireless flash mode is disabled?

The istD can work in either 0 second or 3 second IR remote mode.
The K10D will disable the wireless flash in 3 second IR remote mode.