Yes I am also after transcribing multiple mp3 files. I don't care if it takes a while to do so but I don't want to add file one at a time. Other than that I really like the program.
I just updated Private Transcriber Pro to v2.6.4 which brings batch processing of files, so now you can just drag and drop a bunch of files and it will process them one by one. I thought you might want to know.