Hey there, I realize this is an old discussion. Just wanted to chime in and show my support for clever monkey's question. I believe there are good reasons for unloading a script.
For example I like to take time lapse shots. I also like to take long exposure shots at night with a shutter speed of 100+ seconds. If I have loaded an intervalometer script earlier in the day there is no way to access shutter speed overrides and NOT access the intervalometer script, well, without changing memory cards or physically removing the script from the memory card. I could change the intervalometer parameters to 1 picture and 0 interval but the script still takes time to run and process in the background which can lead to lengthy time periods of waiting for the camera.
It seems logical to me that there should be a way to unload a script so that it doesn't bog down camera processing time between shots, if overrides need to be accessed apart from scripts.
Does that make sense? Thanks in advance for any input.