Some scripts just needs to be triggered but not run ever so often like from a webpage.
It shouldn't be too difficult to make an addon that triggers an external script (like a image renderer) from a relevant Coranto page.
Example:
I have a php script that rip images into icons.
This script must be run from a browser right after i have uploaded some images.
My solution is to hack in a 0 x 0 pixel iframe betwen some text in crcore.pl so that the php page is fetched from the iframe in a relevant coranto page (like: "your images was uloaded successfully [iframe here]...").
What about an addon that could do this and with optoins for both browser mode and as a cgi.