No, unfortunately not. Not sure if maybe there's an app out there that can hook mouse buttons and send a keystroke instead?
Very pity. For now I used AHK to intercept middle clicks and translate into a keystroke but I think native support in the app is much better then any workarounds.
iG0R: Does using AHK to accomplish the middle-click hotkey then prevent using the middle-click to engage/disengage auto-scroll in a web browser or document?