[galaxy-dev] Searching in Galaxy drop down lists

Hello all, I was finding it frustrating to use the genome select drop down in Galaxy. On the public instance there are about 800 entries (mostly bacteria), and for many organisms there are multiple entries (e.g. five releases for human). I was thinking some kind of heirachy would be useful here until I realised how well the search works. I'm now facing the same problem with other long drop down select parameters (e.g. BLAST+ databases). Can the same nice search feature be enabled in any select parameter via the tool's XML definition? Thanks, Peter