Jeff, I don't have the cx2510 (I have the previous model) and I don't have the Kioti 3rd function - made my own. But... I'll take a stab at an answer for you: First off I don't believe unless things have changed that you can have more then one set of remotes on the CX2510. That option is installed relatively simply by bolting on. (I installed it on my previous tractor.) This doesn't impact the 3rd function or power beyond from the loader valve.
If the 3rd function uses the power beyond from the loader valve that will be entirely independant from the rear remote.
Hope this helps.
E.