I'm really not familiar at all with JDF stuff. Ive heard it being talked about for a while now but never needed it so I never looked into it.
And when people call things "hot folders"... are those just shared folders over the network?
A "hot folder" is basically any folder that has an application watching it and, in turn, is expecting to use it as an input / queue. Technically, the folder may be shared on a network or not. If you're familiar with Acrobat Distiller and it's "Watched Folder" functionality you (already) know what a hot folder is.
It sounds like your trouble stems from the loss of AppleTalk support in Lion. The Creo probably supports AppSocket over TCP/IP.
There are a handful of (print-centric) connection types:
LPR (the Creo probably supports this ... it's a tad harder to configure than AppSocket but more secure / flexible when configured correctly)
AppSocket / HP (the Creo probably supports this)
IPP (the Creo may support this ... it *is* printing over HTTP rather like a web browser might do ... although that's an oversimplification)
AppleTalk (dead technology)
Bonjour (I double the Creo supports this ... newer / home-centric things do)
If it does support AppSocket go determine what the Creo's IP address is (YMMV wrt how to accomplish that) and repeat that PPD generic PostScript print install process (described above). When prompted for which method of network connection you want to use choose AppSocket (possibly labeled HP Printing ... I cannot recall and don't have a Mac handy at the moment). The UI that is presented related to AppSocket transmission will ask you for a destination IP address (for the Creo). Input that IP address you wrote down from the Creo. Associate the Creo's PPD (again, as previously described) and you should be up and running. If your Ikon tech can't figure this out I suggest you find another tech since it's not a particularly challenging task (it takes all of 2 minutes, a little bit of data / information and skills that EVERY print tech should understand regardless of their "favorite" platform).
You'll get there. Keep us informed. Nothing in Lion should have permanently blocked you from using your Creo the way you have always used your Creo (RIP).
JR