in reply to Is FindBin the correct way to go

You can allways set it in your script self (as a variable, or in a config file), but why don't you just use lib, since i assume you need the path for loading your modules?
use lib qw(/rootdir/en/scriptdir/);
(and for mod_perl set it in your startup.pl)

"We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.