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I find it very irritating when I click mouse 4/5 to go back/forward in the browser and instead I select the file that happens to be under my cursor. It seems odd to me having a button do 2 completely different things depending on where my cursor happens to be in the window. I use double-click-to-open so this function really doesn't help me at all. For people who use single-click there are still multiple other ways of selecting without opening, such as the +/- on the icon. With the overwhelming number of settings menus in KDE I'm surprised I don't have the option to change this.

Sorry if this has already been posted, I couldn't find another post about it. I was going to post this as a bug report but I found this. Third post says it was intentional.

Consider rewording the brainstorm. Buttons 4/5 are the mousewheel - i had to look at the bug to check what's the issue here.
The behavior is somehow inconsistent/confusing, yes.

Edited. Where is the mouse wheel referred to as 4/5? I've always seen the side buttons referred to as 4/5 in games, blender, etc. I've never seen the mouse wheel referred to as numbers.

run "xev | grep button" from konsole, enter the window, scroll and watch the output