For users who work in Post (for whom Nuendo is made for) it is impossible to work with events that change color.
We sometimes have hundred of tracks and a gazillion small events.
We use colored events to “guide” us through the process.
In my case a Yellow event means that it is unusable, a Pink event means that it needs some TLC, etc …
So there is no way that events can/may change color when selected.
Again, when you are working on a very big session with a controller, we always use “select event under cursor”.
With a gazillion tiny edits, we need to see easily and quickly which event is selected.
To move it, to snap, to process, to set locators, to fade, trim … whatever.
I understand that people are not used to this, but I can not understand the problem.
As far as I can see, (correct me if I am wrong) the only issue is that the outline is hard to see on bright red tracks.
And even that I fail to understand, because I can not look at full/bright colors for even an hour.
My colored tracks/events are all very light, and even on a red colored event, I can clearly see the outline.
As for the option to make it a preference, that has been requested, but there is a technical problem.
Because of incompatible graphics libraries both can’t be used at the same time, it’s one or the other.
I’d say, look for a way to make it work for you (for example, avoid RED tracks), because the problem post users simply don’t have an alternative.