This is the official response I got from HTC, after asking about usb host capabilities on the TP:
"The Touch Pro does not support USB host mode. There might be some third party applications that activates that functionality, however HTC is not supporting it nor does HTC stand responsible for any use of third party applications."
This is really interesting; I was expecting more of an "USB host not supported. Period." Instead they hint that "third party applications" could solve the problem; this seems to confirm what I suspected: that the device is most likely only missing the proper driver. Again, since the class drivers (mass storage, HID, etc.) seem to be present (some drivers I installed myself, just to be sure) it's most likely that the low-level host controller driver is missing. Exactly which driver that is (chipset wise) I can't tell, and with this kind of devices it usually isn't free/publicly availablea and, from what I read, notoriously difficult to reverse engineer...  I just hope I'm wrong and this can be fixed by building the correct cable...
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