Incorporating those settings into a custom view would be great. Actually that's one of the oldest wishes of mine which is more than 4 years old now:https://getmusicbee.com/forum/index.php?topic=8157.0
Now for v3.1 with almost boundless capability for panel configurations, one important setting is missing in your list
the enhancement would also remember column browser, fields/ width/ sorting, thumb browser field/sorting and library explorer field/sorting.
that is the whole panel configurations including panel location of individual elements and sub-panels configuration.
For instance, you might want to place thumbnail browser to left main panel for some views and to left sidebar for other views, or want to show lyrics in right main panel or hide it for another view, etc.
Maybe not for this time, but that feature would be ultimately needed to utilize full potential of v3. Then it won't be a custom "view" but a custom "layout". So I'd like you to think about that too at this point.