Inconsistent behaviour with dynamics when creating parts from voices

Sorry for long comment.
I will try to sum this ideas. (Oh, I hate to write these essays.) There are two point of view to this problem. One is „musical“, how we use to read, write and understand sheet music, and second, how to implement it to program.

In „real world“, as far, as I know, it is "standard" most common practise, to have dynamics assigned to staff. (Orchestral scores, piano scores, …)
I see few exceptions – Vocal comressed SATB score, and may be some Contemporary music.

Therefore, for me, it does make a sense, to be default behaviour, to have dynamics (and hairpins, texts, and so on …) assigned to staff.

Nowadays, this is not possible in actual version of musescore.
DHTS (dynamics, hairpins, texts, ...) is assigned inconsistently, byt idea probalby is, to assign them to voice.
Dynamic range looks promising, but it doesnt seem to affect notation.

How it is now
(voice dynamic works in parts only if it was created before generating parts)

Creating DHTS
dynamic:
- dynamic is created to each selected voice
hairpins:
- if multiple voices are selected, only one (voice one) hairpin is created
- if only one voice is selected, hiarpin is created to that voice, if it is created by keybord, but if you create hairpin by pallette, it is always assigned to voice one

When generating parts
- dynamic is reperoduced to parts coresponding to voices
- voice one hairpins are reproduced to all parts
- voice two hairpins are reproduced only to coresponding part two

When parts are created
dynamics:
- adding dynamic to score produces dynamic to all parts (it doesnt care, which voice is it)
- removing parts from score will remove it from corresponding part, if dynamic was created befor generating parts. If dynamic was added after generating parts, removing it from score removes it from all parts
- removing dynamic from part removes it from coresponding voice of score, if dynamic was created before generating parts. If dynamic was added after generating parts, removing from part causes removing from all parts and score.
hairpins:
- adding hairpins to score produced hairpins in all parts (it doesnt care, which voice is it)
- removing hairpins from score removes it from all parts
- removing hairpins removes it from score and all parts

What to do?

If I leave asside current inconsistency, I think, correct behaviour would be:

1) If DHTS is assigned to staff:
a) when one generate parts from voices, DHTS created in score will be reproduced in all parts created from multiple voices
when parts are already created:
b) adding DHTS to score will be aplied to all parts
c) adding DHTS to part will reproduce it to score and all parts

2) If DHTS is assignet to voice:
a) when one generate parts from voices, DHTS created in score will be reproduced only in part, created from coresponding voice
when parts are already created:
b) adding DHTS to score will be aplied to coresponding part
c) adding DHTS to part will be reproduced to corresponding voice in score

General setting should by, that DHTS will be assigned to staff as by default (as it is most common practise in real world)
- this wouldnt affect existing scores, as this would be new feature
- users would have option to change this default behaviour to Generally set, DHTS will be assigned to voice by default (in Preferences - advanced, or in Style settings)

3) If DHTS will be generally assigned to staff (in Settings)
a) only one, „staff DHTS“ is produced, even, if multiple voices are selected
b) one can assign DHTS to voice, by some extra key, for example CTRL (so CTRL + Dynamic will produce dynamic assigned to voice), if multiple voices are selected, DHTS will be created to each voice

4) If DHTS will be generally assigned to voice (in Settings)
a) multiple DHTS are created, one for each voce
b) one can assign it to staff by some extra key, for example CTRL (so CTRL + Dynamic will produce dynamic assigned to staff), if multiple voices are selected, CTRL + DHTS will produce only one, „staff DHTS“

#304456: Inconsistent behaviour with dynamics and hairpins, when use parts from voices