They seem to work fine with RHEL 5 and Sun Type 6 keyboards. We do this at work on our systems. We just remap the keycodes to F keys. Something like
xmodmap -e 'keycode 232 = F13' for the Stop key.
That's probably because I'm using Sun Type 5 with mini-din convertor to USB. Under OpenIndiana these keys work fine, but aren't working on Linux. Must be some driver specifics. Type 6 and Type 7 work better indeed, but they are not so ergonomic as Type 5 for some reason.
