How do I change the default tick rate for ThreadX at configuration?
In order to do that, you'll have to add ThreadX Source to your project to the HAL/Common layer (Add >> Framework >> RTOS).
In the properties for this entry you can find "timer ticks per second". The default value for this is 100, resulting in 10ms tick rate resolution. Bear in mind your build time for your project will be extended as ThreadX has to be built from source.