Hi. Glad you like the plugin!
Yes, kind of. Within a lettered Preset class (A, B, C, D, etc), just sending a remote control number button press will select the Preset number (0 through 9) within that Preset class. Use the "Remote Control Button Press" action to send a number button press while you have the Sirius or Home Media Gallery (Internet) source selected. The Pioneer Receiver plugin will send the correct remote control button press command for whichever source you have selected.
Selecting a different Preset lettered class, however, isn't quite as simple. This is because 1) there's no way to query the receiver to see which class is currently active, and 2) you can only cycle forward through letter classes and cannot select one directly. Having said that, you can send a raw command to the receiver to select the next Preset class, then send the remote button number press for the Preset within that class. Use the "Send a Raw Command' action. Configure the action to send "38NW" (without the quotes) for Home Media Gallery or "16SI" (no quotes) for Sirius. This is equivalent to pressing the CLASS button on the remote control while those sources are selected. The receiver treats these commands just as if you'd pressed the button on the remote, so the first "press" of the CLASS button simply displays the current class, while pressing it again within a few seconds actually changes the class to the next one.
If you're curious, I used Pioneer's documentation (
here) as a reference when creating the plugin. You can send any of the commands listed in that document to your receiver using the "Send a Raw Command" Pioneer Receiver action.
Hope that helps.