After glancing through both the manual and the MIDI guide, I don't see any indication that it's possible. However, there might be a partial workaround of sorts:
You can use a pedal to advance from one registration to another in a given bank. You can save a rhythm number in a registration. And you can create up to 100 user rhythms.
So you might be able to create separate user rhythms from a single preset rhythm, where each user rhythm contains just one section of the preset rhythm. Then you could set up different registrations to select the different user rhythms, in the sequence you want to play them, so you can use a pedal to advance through the different rhythm sections as desired.
But that sounds like a lot of work, and there's no guarantee that it would function the way you want. For instance, fills are 1-shot bars rather than loops, and I don't know if you can create a user rhythm that contains just a fill, or that starts with a fill and segues into a main loop-- although you might be able to copy a fill from a preset rhythm to the intro of a user rhythm, and have the rhythm start with the intro (or fill) and then segue into a loop.
Anyway, you might want to look for a different arranger that can already do what you want, so you don't have to jump through hoops to achieve what you want to do. Otherwise, if you want to go ahead and give the CT-X5000 a try using the workaround described above, make sure there would be no problem returning it if it can't be made to work according to your needs.