Hi you all!
I just found that in the template directory, you can enter as many directories as you want, it will be ok in the "Song Template" window! :)
I thought it was limited to 5 (+ general=6), but I just saw that 2 arrows appear on the right !! Combined with & for Alt-access (see https://noteworthycomposer.com/composer/usertip4.htm#shorttab), (http://www.noteworthysoftware.com/composer/usertip4.htm#shorttab),) this is GREAT !
Now I have to move my templates to their new proper place !
Houba!