Hello all.  First of all thanks to Galaxy developers and supporters for this great tool  -- I'm experimenting with adding my custom tools to galaxy and I'm very impressed with how simple galaxy makes this process. 

Some of the tools that I'm adding to my local instance take reference files as a parameter.  These files are often large and fairly static.   I understand that I can create a data library where users can select the reference file needed and import into "history" for analysis.  However,  I would like to know if it's possible for a tool's input parameter (dropdown) to enumerate these files from a public data-library (to avoid the steps needed to import from library into history) and have that file pathname become the value for my parameter?

As an alternative, would it be possible to load such a drop down from files (of a certain type) existing at some predefined system path?

Thanks in advance,

-AR