Solr: incremental boost request without resorting to DisMax - is this possible?

Question

I have a Lucene disjunctive query: (clause_1 OR clause_2 OR ... OR clause_N) , and I want to add an additional boost request above it, like the bq parameter in parser DisMax .

I tried {!edismax qf='' bq='my_boost_query'}(clause_1 OR clause_2 OR ... OR clause_N) , but it returned a null result. (I assume this could be caused by an empty qf parameter)

Is it possible to do this without rewriting my request using the DisMax format? Perhaps some special Lucene query parser syntax like _val_ etc.? Or maybe the DisMax shell does the job, but I just missed something in the syntax above?