@clean, I've gotten used to using multiple (vertical) panes in InfoQube and have often thought it could be of great help in a file manager.

Let me add that of course I asked for such features, in vain, before complaining to third parties.
Or then, explain to me why I'd be totally wrong again, by asking for features that should have been available for the last 15 years.
-clean
There's no harm in asking

All developers have their ways of deciding and at the end of the day 40 is right in saying (more or less) take it or leave it. Dopus -to me- make some weird decisions, hiding a lot of the power and capability, thereby forcing the user to look up help or go on forum and invest a lot of time in figuring out how to do things. It's almost like they're trying to make it easy
looking. But end up making it more complicated than necessary. (Let's face it people dont drop that kind of money unless they want more capability.) XY let's you see a lot of it's power very quickly.
My peeve with Dopus is the viewer has a couple of minor flaws that really hinder usage of Dopus for working with images. Maybe they think that's for specialist software, I strongly disagree (as do others - but probably not 'enough') and it's their call at the end of the day...
I still use it every day and like it.