I think you can change the tab at the bottom of the screen by editing /home/dsl/.fluxbox/init. The fonts are controlled by the fluxbox style - if you want to change them copy one of the styles from /usr/share/fluxbox/styles/ to /home/dsl/.fluxbox/styles and edit it to suit. The slit applications specified in /home/dsl/.fluxbox/slitlist. There should be documentation on all of this at the fluxbox home page.
As for the second part of your question maybe adding Code Sample | mount -o remount,umask=000 | to /opt/bootlocal.sh will work? |