Really simple GUI (and very basic).
Did a test with regshot which only found 3 minimal unavoidable modifications (prefetch, MRU & RNG).
Blurb from the site:
Bat To Exe Converter
Bat To Exe-Converter converts your batch-script files to exe files.
Features and differences to usual batch files
# Ghost applications
# Additional binaries, icons, version informations
# Hidden source
Web site http://www.f2ko.de/English/index.php
Download http://www.f2ko.de/English/b2e/download.php
n.b. In the help file it states that some AV have I.D'd it as a virus and this is a false positive. I've checked it with AVG, AVAST and Clamwin all with the latest updates to find its clean. Test it yourself though I guess but I'm happy