In my opinion, you should NOT modify directly the idapi32.cfg file, since it's not necessary at all.

You're surely in one of these two different cases:

a) you're modifying an application for which you've got the paradox/other source code
b) you're adding a pdox/other bde application which is completely separate from the other apps using bde

If, as i argue, the app you're adding is completely separate from the others, it SHOULD SURELY use a different idapi32.cfg, and if it's not so it's a badly written application; since each app using the bde can and should have its own bde configuration, an app which uses the shared idapi32.cfg and cannot modify it by herself, it's badly written.

That's my opinion!