Re: two problems
Reply #1 –
Hey Lorenzo,
Number 1 can be addressed with judicious use of hidden rests; headless, stemless, muted notes and careful positioning.
Number 2 is a candidate for RickG's "Markup.rg" object.
https://forum.noteworthycomposer.com/?topic=9083.0
The command structure is quite obscure, so Opagust's related usertool is quite useful:
https://forum.noteworthycomposer.com/?topic=10207.0