score mixing

[michael solomon]

Hi,
I have nested documents and use in BlockJoinQueryParser.
In parent documents I have "rank" field that give an arbitrary score for
each parent.
It's possible to mix the original scoring with mine? i.e:
SolrScore+rank=finel score
or(proportional scoring..)SolrScore/MaxScore + rank/MaxRank = finel
score(between 0-1)
Thanks,
Michael