A kickstart 1.3 a500 cannot boot a wb 2.0 directly unless you do some form of softkicking or have a phisically kickstart switcher for changing roms on the fly.
Maybe the patch that you are referring is that the system try to softkick, but it can't maybe because it didn't find the adequate rom.
On the other side, winuae will read the disk only if you have a scsi controller on your pc, that can be use to connect your scsi drive to it. I see no problems on it.
Hope i have helped, if you have more questions, feel free to ask.
:-)
