I've been using Jriver media center along with Jaikoz as sort of a post processing step. It has some nice analysis features for bpm, tempo, etc. I've specifically selected which tags I'm allowing it to write and which ones stay only in the library (internal database).
Do you see any issues with doing this? The reason I ask is after doing this a few times I've noticed Jaikoz displaying "?" mark triangles in some of the fields that were not there before and this usually mean some sort of character code issue.