Editing "read only" variables [Novelty]

[Huldra]

I was wondering if it is possible to change some read only variables to variables you can edit/change.
I was planning on havning a script attached to an object, so when the mouse hovers on it, the mouse is moved/smacked away. If its not possible I will have to figure out something else for the minigame.
I'm currently using Novelty, but I'm willing to use renpy if it is easier to do theese kind of things.