I'm sure the best way for me to solve this issue myself is to ask it publicly, so...
If I have two {!join} queries that select a collection of documents each, how do I create a filter query that combines their results? If I do fq={!join....} {!join...} it only considers the first. >From what I understand, the Lucene query parser should combine these two with an implicit OR, no? Upayavira