as many people have pointed out over the years, the inability to perform Sub-Folder searches in Rig Manager is extremely frustrating. Having folders is currently more of an impediment than a help much of the time. Therefore, I am considering removing all folders from my Local Library and just having a single rig pool. However, to get the most out of this form of library it would be really helpful to have multi layer searches. This would work as follows:
find all Rigs where author = Xxxx
From this subset no find all Rigs where Amp = Marshall
From this sub sub set find all Rigs where Speaker = V30.