Thanks for the suggestion Robert.
However if I could go through the trouble to create a new variable at the beginning of each run and destroy it at the end, I could also (and more easy IMO) reset a persistent variable at the beginning of each run (thus making it act like a temporary one). The idea is to have a variable that always begins in a certain (default) state without extra effort.
For now I add the variables I need to the project through scripts and then move the ones I want to be temporary from the persistent list manually.
