I was looking in FSUIPC for a way of setting up reverse thrust since I've got an extra throttle control. Is there another way to set it up?

As they often say, Google is your friend.

 

Here's a couple of links to help you.  I encourage you to search the FSUIPC forum for this topic.

 

Basically you calibrate the mid point of your throttle lever to 0 and the bottom stop (which would be idle on a recip aircraft) to a negative value.  You set a little null zone in the middle between idle and reverse so that everytime you retard the throttle (or power lever in a TP) it doesn't jump suddenly into reverse.

 

http://forum.simflight.com/topic/69532-engine-reverse-thrust/

 

http://forum.simflight.com/topic/74211-setup-reverse-thrust-with-thrustmaster-hotas-x/

 

http://forum.aerosoft.com/index.php?/topic/71249-fsuipc-setup-to-have-reverse-thrust-with-the-otter/

 

I have done it on several of my TP aircraft but with my Hotas X I lose a lot of travel in the power lever.  It makes fine power adjustments tough to nail accurately.  Another option is to setup a button press on your flight controls thru FSUIPC.  I believe the command is "Throttle Dec" and check the "repeat if held" box.

 

http://forum.avsim.net/topic/381645-fsuipc-reverse-for-a-button/

 

http://www.flightsim.com/vbfs/archive/index.php/t-237809.html