I'm on Xubuntu 16:04 and trying to configure my laptop - with USB
      mouse Logitech RX250 for Blender which uses a lot of middle mouse
      buttons 
      but I'm stymied: 
    
    xinput --list
      gives:------------------------------
    â Virtual core pointerÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=2ÂÂ Â[master
      pointer (3)]
      â â Virtual core XTEST pointer  Âid=4 Â[slaveÂ
      pointer (2)]
      â â Logitech USB-PS/2 Optical Mouse  Âid=11 Â[slaveÂ
      pointer (2)]
      â â SynPS/2 Synaptics TouchPad  Âid=13 Â[slaveÂ
      pointer (2)]
      â Virtual core keyboardÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=3ÂÂ Â[master
      keyboard (2)]
      ÂÂÂ â Virtual core XTEST keyboardÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=5ÂÂ Â[slaveÂ
      keyboard (3)]
      ÂÂÂ â Power ButtonÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=6ÂÂ Â[slaveÂ
      keyboard (3)]
      ÂÂÂ â Video BusÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=7ÂÂ Â[slaveÂ
      keyboard (3)]
      ÂÂÂ â Power ButtonÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=8ÂÂ Â[slaveÂ
      keyboard (3)]
      ÂÂÂ â Sleep ButtonÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=9ÂÂ Â[slaveÂ
      keyboard (3)]
      ÂÂÂ â Chicony USB 2.0 CameraÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=10ÂÂ Â[slaveÂ
      keyboard (3)]
      ÂÂÂ â AT Translated Set 2 keyboardÂÂÂÂÂÂÂÂÂÂ ÂÂÂ Âid=12ÂÂ Â[slaveÂ
      keyboard (3)]
    -------------------------------------
    
    and $ xinput --list-props 'Logitech USB-PS/2 Optical Mouse'
      gives:
    --------------------------------------
    Device 'Logitech USB-PS/2 Optical Mouse':
      ÂÂÂ Device Enabled (137):ÂÂÂ 1
      ÂÂÂ Coordinate Transformation Matrix (139):ÂÂÂ 1.000000, 0.000000,
      0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000,
      1.000000
      ÂÂÂ Device Accel Profile (268):ÂÂÂ 0
      ÂÂÂ Device Accel Constant Deceleration (269):ÂÂÂ 1.000000
      ÂÂÂ Device Accel Adaptive Deceleration (270):ÂÂÂ 1.000000
      ÂÂÂ Device Accel Velocity Scaling (271):ÂÂÂ 10.000000
      ÂÂÂ Device Product ID (257):ÂÂÂ 1133, 49232
      ÂÂÂ Device Node (258):ÂÂÂ "/dev/input/event7"
      ÂÂÂ Evdev Axis Inversion (272):ÂÂÂ 0, 0
      ÂÂÂ Evdev Axes Swap (274):ÂÂÂ 0
      ÂÂÂ Axis Labels (275):ÂÂÂ "Rel X" (147), "Rel Y" (148), "Rel Horiz
      Wheel" (266), "Rel Vert Wheel" (267)
      ÂÂÂ Button Labels (276):ÂÂÂ "Button Left" (140), "Button Middle"
      (141), "Button Right" (142), "Button Wheel Up" (143), "Button
      Wheel Down" (144), "Button Horiz Wheel Left" (145), "Button Horiz
      Wheel Right" (146), "Button Side" (261), "Button Extra" (262),
      "Button Forward" (263), "Button Back" (264), "Button Task" (265),
      "Button Unknown" (260), "Button Unknown" (260), "Button Unknown"
      (260), "Button Unknown" (260)
      ÂÂÂ Evdev Scrolling Distance (277):ÂÂÂ 1, 1, 1
      ÂÂÂ Evdev Middle Button Emulation (278):ÂÂÂ 0
      ÂÂÂ Evdev Middle Button Timeout (279):ÂÂÂ 50
      ÂÂÂ Evdev Third Button Emulation (280):ÂÂÂ 0
      ÂÂÂ Evdev Third Button Emulation Timeout (281):ÂÂÂ 1000
      ÂÂÂ Evdev Third Button Emulation Button (282):ÂÂÂ 3
      ÂÂÂ Evdev Third Button Emulation Threshold (283):ÂÂÂ 20
      ÂÂÂ Evdev Wheel Emulation (284):ÂÂÂ 0
      ÂÂÂ Evdev Wheel Emulation Axes (285):ÂÂÂ 0, 0, 4, 5
      ÂÂÂ Evdev Wheel Emulation Inertia (286):ÂÂÂ 10
      ÂÂÂ Evdev Wheel Emulation Timeout (287):ÂÂÂ 200
      ÂÂÂ Evdev Wheel Emulation Button (288):ÂÂÂ 4
      ÂÂÂ Evdev Drag Lock Buttons (289):ÂÂÂ 0
    -------------------------------------------------------
    I've tried xinput --set-prop 'Logitech USB-PS/2 Optical
        Mouse' 'Evdev Wheel Emulation Button' 3
    
    where 3 is a variety pf numbers tried but nothing seems to get
      MMB emulation working on blender.
    Any clues?
    Tom te tom te tom