Blender's application handlers are listed here, but is it possible to create a new one?

For example, I'd like an application handler which is a callback for every time I add a strip to the Video Sequence Editor.


Question: What are the uses for a roasting pan? Do I really need a roasting pan?
Answer: I use mine, but I'm known for 20+ pound hunks of meat...In that case it's pretty much a requirement, both for the dripping, etc and for just being big and sturdy enough to handle the weight.

If you're not cooking anything that big, I wouldn't worry about it. Throw some starch in the pan to soak up the grease, and move on, or go old school, and cook it right on the rack with a Yorkshire pudding underneath to catch the drippings.