Ok, here’s the AutoHotkey script (you can grab it from autohotkey.com):
#SingleInstance, force
#NoTrayIcon
Run, C:\Program Files (x86)\Epic Games\4.14\Engine\Binaries\Win64\UE4Editor.exe, C:\Program Files (x86)\Epic Games\4.14\Engine\Binaries\Win64
#IfWinActive, ahk_exe UE4Editor.exe
RButton::MButton
Return
MButton::RButton
Return
It works, but it’s not as efficient as an official feature would be. It basically switches the Right Mouse Button with the Middle Mouse Button (but only while working inside UE4). This applies to the entire program, not just the viewport, which is a bit inconvenient when trying to bring up the right click context menu for some UI items.
Is there anywhere I can submit a feature request? A “Mouse Settings” item below the “Keyboard Shortcuts” in the preferences menu would be nice.