After digging through the complete thread, I still have not made any real progress.
I own two Via 6212L USB x5 cards. Both work fine in win98Se on my 440BX Pentium III Coppermine board.
If I stick them into my Socket7 and Super Socket7 boards (all SIS chipsets), the board detects the cards, loads the full driver array (compared with working P3), but the cards seems like dead in the water: No matter what I stick in, Win98 doesn't care one bit. Mouse doesn't light up, no pop-up message, nothing. As a final measure, I tried Nusb, but the result was identical.
From reading the thread, I found one observation interesting: Some cards have a voltage regulator. And my mouse doesn't have any LED power when plugged in. I have a NEC card in the mail, I'll give that a spin too.
The other message from the thread seems more interesting now: Use a Nic and go through network. I already use CF-IDE bays.
My only problem is that one board has no working onboard USB and I would like to get at least USB 1.1 running for peripherals. I just wouldn't know what card to look out for.
Retro PC warning: The things you own end up owning you.