I found a workaround. Download autohotkey (https://www.autohotkey.com/download/) make a script in notepad that contains the following:
SendMode Input ;don't touch this
SetTitleMatchMode,2 ;don't touch this
#if WinActive("Fusion 360") ;makes all remaps working only if the active window has quoted text in the title
RButton::+MButton ;remaps the right click to behave as the shift + middle
+Mbutton::RButton ;remaps the shift + middle to behave as the right click
XButton1::RButton ;remaps the 4th mouse button behave as the right click
Save it as FusionOrbit.ahk to C:\Users\<user>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup and it will run at startup.
Thanks to @Reloecc for the 4 year old (but still working!) solution. I still can't believe autodesk hasn't made the gesture menus able to be turned off with a simple checkbox.