Ok, the scenario. We are in an edit session. We want to delete the next 15 characters (we use ^d for delete). Instead of hitting ^d 15 times, why not SELECT the 15 characters.

Presumably, AT knows how many chars are selected, right? So, you could select them, and have a function in the right click to perform XX keystroke that number of times.

Voila! You can select text and hit one button to delete it.