USB booting :: RPM

Is that option included in the USB version?

If not, how can I install it?

No it's not. DSL uses the Debian package system, requiring the installation of dsl-dpkg.dsl.
If you want RPM, you can try installing from a deb package or from source, but i don't really see the point when the deb package system provides the same feature set built specifically for debian-based distros.

You can use the alien myDSL extension program to convert a *.rpm package into a *.deb package and then you can install it with

sudo su
dpkg -i name_of_file.deb

assuming that you have already "Enabled APT" from the menu.

original here.