My wishlist for this great piece of software:
- Ability to pan in PDF’s with middle mouse Button
- Ability to change between each of split editors with Tab key
…will be updated! 
Wouldn’t you want the tab key to insert tabs into your docs? I’m pretty sure I would.
You can already switch between split editors (and the binder) with Ctrl-Tab. This works on both platforms. Changing how scrolling is done might be more difficult on both platforms, since in both cases a third-party PDF viewer is being used to display the content. It’s like of like having a portal in your application where another mini-application is displaying content. Not quite like that, but it’s a reasonable way to look at it. We can control the stuff going on around it, and in a limited case send messages to it if it has been programmed to allow for that, but otherwise it is its own thing.