Autoselection in "Staff Text Properties"

Steps to Reproduce
Create/open score and add an instrument with more than one channel (e.g. trumpet)
- Create/Select a "Staff Text" (Cntrl+T)
- Right-Click the Text and choose "Staff Text Properties"
- Use one of the four dropdown menus to select an channel (other than "normal")

Expected behavior
There could easily be an automatic selected for an unused voice left to the dropdown menu

Current behavior
You have to explicitly select one or more voices. If you press "Ok" without having a voice selected, the choice of the dropdown menu gets discarded.

Why is this important (for me)
I'm using MuseScore to arrange Musicals (including Keyboard Score with many sound changes). To create the sound changes, I'm using a custom instrument with one channel for every sound I need in my keyboard score (nearly every instrument MuseScore provides is in there). Finding and selecting the right sound takes some time and if you miss to select a voice, you have to do it all again.

Version/OS
OS: macOS 10.14, Arch.: x86_64, MuseScore version (64-bit): 3.2.3.22971, revision: d2d863f