This is a very interesting thread - I just learned some new and very cool things about MusicBee - thanks thehay95 for starting this!
First, I do understand what you mean by scrolling using the mouse wheel click instead of rolling the wheel - this is something I have occasionally used in the browser to set up a variable-speed auto scroll of long pages. But frankly, I rarely think about it, and I just use the mouse wheel or drag the side bars to move around. I don't really like to use the middle button for scrolling simply because you have to continually start and stop the scrolling session if you want to do anything else with the mouse. At first I thought your request to be able to use the middle button to start a scroll session in MB made sense too - it is a nice feature to have for those who get used to that function.
But I did not understand your comment about the mouse wheel button starting a search function. You see, I almost never click the mouse wheel for anything, anywhere, so I had never tried this in MB either. And what I found when I tested it is a REALLY neat function that I would now hate to loose!
In simple terms, just using the middle button to click on any field in the Album and Tracks display will instantly do a search for any other track in the library that has that same field value. What a great way to do a quick search for duplicate songs (especially if you have lots of compilation albums or live performances), or just to see what else might be tagged with a particular genre or whatever without having to bother with opening a new tab or changing the main display options to manually go look for those things.
When I was recently trying to clean up all the genre tags and standardize them in my library, I spent days on this, having to do constant back-and-forth comparisons in multiple tabs. If I had known about this middle button quick search, that task would have been so much easier. I also recently went through a very tedious process of checking all the songs in a large double album compilation for an artist where I already had over twenty albums in the library - I just wanted to see if there was anything on the new album that I didn't already have, but manually looking for, or doing a search for, each track was a real PItA. Even trying to use the duplicates manager for this is relatively slow and confusing. How great it is now to just click on the middle button for an instant response to that query.