yes. note that now Alt-mouse1 == mouse2, which is hard to detect because by default Alt-mouse1 causes the window manager to move the window (i.e., the application does not see the Alt-mouse events).
yes.
note that now Alt-mouse1 == mouse2, which is hard to detect because by default Alt-mouse1 causes the window manager to move the window (i.e., the application does not see the Alt-mouse events).