Dave,
The macro method would require a "dummy" command from the original Delphi remote that has no efffect on the command you are trying to perform. Each command programmed into the Intellipad would actually be a macro consisting of the desired command followed by the "dummy" command.
I once programmed a Philips DVD/VCR combo into a universal remote using a slightly different method. Since the TV/VCR command had no effect on any operation (using video outputs only), I was able to teach the universal remote, through trial and error, the desired command immediately followed by a quick "stab" of the TV/VCR button. It took a while, but it worked. The "dummy" command resets the toggle bit in the device, and successive desired commands are possible.
Of course, this all depends on the availability of a "dummy" command, but, this should give you some ideas.
Good luck,
Scott