X and Fluxbox :: Resolution Change

I have been running DSL on a libretto 100ct for a while now the only issue i have is the the libretto's lcd is 800*480 i used to just change the XF86Config file when i had suse on the libretto but each time i change the XF86Config on DSL it always gets reset. Is there away around this or am i just doing something worng this time ?

Plus due to the odd resolution i dont get to see all the boot messages as the scroll off the bottom of the display is there away to change this also ?

many thanks
G

original here.