A "Search all OSB" option should be added somewhere
You mentioned options for Google search versus search OSB through the NIF interface (https://www.neuinfo.org/mynif/search.php?q=nlx_152590&dis=Open%20Source%20Brain&t=indexable&nif=nlx_152590-1&b=0&r=20). Why not put one search query and put two buttons that each do one of these?
Implemented Redmine Search Box and some layout changes to the header
TBD: Do not look for changeset at the beginning and sort results showing
firstly projects and wiki