USB booting :: Save apps to USB key

Hello everyone,

I have just installed DSL 1.3 on my USB key and it works perfectly. I use the myDSL Browser to install extra apps, but I have realized that those programs won't be save on the USB key, they are only available until the next reboot.

Is there a way to save those myDSL package?

[EDIT]
I have successfuly saved fluxbox-0.9.11, by editing .filelist.dsl. I added /opt/fluxbox-0.9.11 and it survived a reboot. But how to do when the software isn't in /opt? I would like to save Xfree86, mplayer...
[/EDIT]

Thanks for your help!

original here.