Right. The model supports lists of simples, but the GUI doesn't, though that's something we'd like to eventually add. There is an issue for it (https://bugzilla.redhat.com/show_bug.cgi?id=RHQ-521), but it's not currently slated for a release (feel free to submit a patch ). In the mean time, there are a couple alternatives that are supported by the GUI:
1) a simple whose value is a delimited list, e.g. "value1, value2, value3"
2) a list of maps of simples, where each map contains a single simple
Thats great Ian, thanks for the help.