CMSIS-RTOS time slice: Is any way to use ticks or microseconds

Hi,

I want to use STM32427 instead of STM32407, but uVision V4 doesn't supports that chip.
So I upgrade uVision from V4 to V5, and plan to use CMSIS-RTOS RTX instead of RTX.

But now I have some questions after read the paper named "Migrate RTX to CMSIS-RTOS":

1.How can I delay a thread or pend a semphone less then 1ms?
(I have a thread need to do periodic things and pend some thread messages, so the timeout should less then 1ms)

2.If CMSIS-RTOS RTX doesn't support, can I still use RTX on STM32M427 by uVision V5, is there any problem?

Thanks!
Best regards