[edited from support email] - see email for more information

Unfortunately, this is not currently possible. The closest you could get to continually monitoring the users input would be to use the software's continuous joystick input feature.
We plan to add this feature into our 2010 copy of DirectRT; however it will not be ready for release until the mid-late September of 2009.

If you would like to read more on the continuous joystick input feature, see the following help article:
http://www.empirisoft.com/directrt/help/directrt_samples_of04_joystick_continuous.htm