Tobye - Sorry, I didn't realise you were referring to the trigger once event as well.
Arima
In my project, I'm trying to keep to as few events as possible. I have all of the buttons in a family. Many of them are different sizes, but I want them to all have one thing in common. When the mouse is over them, they pop up from their current scale to 110%. For this reason, I can't use scaled 0.55, as that would affect all objects, including those that are already the correct sprite size.
I suppose now I can use the trigger once with *1.1 and /1.1, and that gives me the effect I want, but I can't see the point of having scale at all for my project.
The only time I've ever needed to use scale is regarding buttons so far, but I'll switch that over to size.
Still struggling to think of a single time I would ever need to use scale over size. Using scale, you'd rarely ever want to go over 1, as you would start to see pixels.