I found my own answer; no.

I'm using AnyHID, a nifty tool that came with HIDMaker. I can intercept all USB communnication and display the data, really nice.

First of all, they are reports, not endpoints. I can select in AnyHID whatever report is defined for the device, and there is only one report for both IN and OUT; report 0.

So no, you can't mess with the report unless you modify the generated files by EasyHID and add reports.

Robert