Thank you Brian (Benfarmer) it seems you where spot on with your explanation why scripts execute twice when invoked by TAB.

Thank you Michael for taking the time and addressing my issues in detail. I use the TAB method out of convenience because it seems to be the fastest method to quickly try out scripts during development so its great if the next update allows this.
Unless I'm doing something wrong editing a script file in the MoI commands folder required me to restart MoI after each edit in order to get MoI to recognize the changes. I already discovered that it has its advantages to assign objects to variables and to use the variables in factories.