As a software engineer who deals with customer problems of referenced files not being found when they open a document, I consider it a serious problem. No customer should be expected to search manually for a file except as a last resort. Poser needs to treat any additional runtime folders just as it would its own runtime folder when it comes to searching for relative files. If it can't find a file in ./Runtime/Geometries/, it should search /Geometries/. Guess I'll go submit another bug.