Ability to modify "gate time" and default velocity for all articulations within UI

Your idea

Currently you can save using the "uncompressed MuseScore folder (experimental)" format and edit the mscx file to specify how articulations should be played by default, but this is quite painful and not reasonable to expect for the average user (who is likely to introduce syntax errors into the xml etc.).
A screen that allows editing these values would be well justified.
The default gateTimes are not appropriate in many cases, even for unarticulated notes.

Problem to be solved

Having to save using the "experimental" format then edit xml files:

        <Articulation name="staccatissimo">
          <velocity>100</velocity>
          <gateTime>33</gateTime>
          </Articulation>

Which is especially painful as it has to be done per instrument (to be clear, it's good that level of control is available, but painful when you want to apply it to all 30 or so!)

Prior art

No response

Additional context

In fact I have a far bigger concern, which is that from the testing I just did, MS4 seems to be ignoring this completely. Indeed the only code that seems to look at these gateTimes etc. is in the MIDI export code (compatmidirender.cpp).

It appears the plan is to replace this with "articulations profiles" that can be edited etc. Which is fine provided a) the articulation profile info can be stored with the .mscz file itself and b) is used for both MIDI export and playback (and c), where possible, that it work for Muse Sounds as well as regular sound fonts such as MS Basic). If there's already an issue that captures the intention behind that feature then this can be closed (and if community assistance would be useful for working on it, I'm happy to put up my hand).

Start by reviewing compatmidirender.cpp and the mscx Articulation fields shown in the issue, then trace the proposed articulation-profiles work. Done means defining a UI for changing gate times and default velocities across articulations, with the values stored in .mscz and applied consistently to MIDI export, playback, Muse Sounds, and sound fonts.