I want to make some local changes to the DayPilot sources and minimize the sources again, What level of minimization and name mangling is required (or even is the minimizer you use available)
It is minimized using ESC (ECMA Script Cruncher). You can find the instructions here:
http://www.daypilot.org/how-to-compile-daypilot-pro-source.html
The ESC download page is no longer available but you can download it here:
http://www.daypilot.org/files/ESC.zip