I’m good with everything except the <output dir>. I can’t figure out how to pass that directory information from Galaxy to the RUM_runner.pl in such a way that Galaxy will be able to subsequently capture the data. Does anybody have any advice, or can someone point me towards an existing wrapper that does something similar?

You have two options:

(a) you can set up the tool to report only a subset of outputs from the tool;

or

(b) you can use a composite datatype to store the complete directory:

http://wiki.g2.bx.psu.edu/Admin/Datatypes/Composite%20Datatypes

Best,
J.