some recap, for those who are interested in this. <labelExpression> just trigger python snippets/code/etc. @ startup. after that, they are fix. <scriptMenuStripDynamic> does the job dynamically when you trigger the menu.
is there a way to access the menu items with python to change dynamically the label name? or adding submenus etc.? in this case i want add a specific hipname beside the label.
thx for help or hints.