Just built a quick addon (mostly for myself) with my interaction preset so that I can avoid using the numpad to switch between the orthogonal directions (Top, Bottom, Left, Right, Front, Back).
Interaction is like this:
View - Key
Front - Alt+MMB Click
Back - Alt+MMB Double Click
Left Side - Alt+MMB Tweak Right (Tweaks are like swipes on a tablet)
Right Side - Alt+MMB Tweak Left
Top - Alt+MMB Tweak Down
Bottom - Alt+MMB Tweak Up
At first glance, all the directions might look reversed, but it works like “throwing” the model into position. It’s wonderfully fast and does not interfere with the pressing alt after starting a rotation to snap into ortho views. Give it a try and give me some feedback!