Is it possible to divide mulab in 2 parts( Mulab and users)for effects and synths
Gives this more usrfriendlyness?

That's already the case.

But if i choose a effect or instrument from a rackslot .. i do get Mutools-> Effects and Instrument

From there i cannot see what a user or Mutools effect /instrument is ..or do i miss something

As soon as you save MUX patches, you'll see a User group too.
Also when you add MUX patches directly into the user library folder, which by default is MuLab/User/Lirary/Mux.

Also see http://www.mutools.com/mulab/docs/preset-library-management. html

Hope this helps.

YES!..there is a (new)user folder where the usereffects and usersynths made within the MUX enviroment (= deep editor where to construct with the modules the desired user effect /usersynth )are stored
It seems that i can choose the folderlocation and Mulab automatically add a user folder when i store the made effect or made synth in the deep editor.

Perhaps more userfriendly to add the user folder permanent..so that the user of Mulab is aware of the soundconstructing effects/synths in the MUX

Perhaps also better to use the name "MUX deep editor" for the deep editor