Jay,
to answer your questions.
1) Yes, just turn syntax highlighting on. Emacs OACS doesn't change the syntax highlighting.
2) Like all files for which OACS is activated, OACS identifies it self as OACS. OACS is a so called minor mode which combines with the major mode of the file being edited. You will that the OACS menu option in ADP files is specific to the ADP sub mode. In short you automatically enter the ADP sub mode when you open an ADP file.
/Bart
