I was already familiar with this workaround, having this code example from Al Layson, but thank you anyway.
My intention is slightly different. Instead of writing code that hooks into a given functioanllity,
I would like to change the already coded RMB menus.
There is much stuff inside we never use and much stuff wel would like to add.
So the best option for us would be to configure tailored menus, but not to create new ones.
Only then we could be sure, that a CTRL+RMB is not used by expedition as default.