This program was very fast and worked without problems. It is one of the few that uses only syslinux and not syslinux with grub or something similar. The only problem I encountered was the non-supported Rescatux (you should support this) and Fedora + Ubuntu Minimal which displayed nothing when I clicked on "Install".
Nice project! You did a great job. Thank you!++
Very easy to setup, fast and without errors 1 problem and therefore only 4 stars. It does not seem to support UEFI BIOS. I had to set BIOS to CSM legacy boot to be able to boot from the USB. This will probably cause problems when I want to install from this multibootusb.