Additional work was done today. Athoik, SatDreamGr, defined a way for enigma2 to check for usb devices:

Instead of adding more and more checks on ep_XX values I created a generic check that will check the link if contains usb, if that is true, then we have a usb.

So when new values appear on ep_XX you don't have to care any more, enigma2 will identify those usb devices at once, as long as the link contains usb in the path.
In other words, he gave us a way to make the Hauppauge 955q work the first time, but fixed it in a more correct manner today. This update is available now as an online update in SatDreamGr experimental images for the SF4008.

I was having trouble before this last fix getting more than one Hauppauge 850 to be recognized when the Hauppauge 955q was attached. As a test, I connected 3 Hauppauge 850's to the SF4008 along with the Hauppauge 955q. The results can be seen in the screencaps below.

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