Hi Simon, for a shortcut that switches between Split/Top/Front/Right/3D see here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3808.2

for switching just the 3D view to a specific angle, use this:

script: var up_down_angle = 50; var left_right_angle = 45; var vp = moi.ui.mainWindow.viewpanel.getViewport('3D'); vp.setAngles( up_down_angle, left_right_angle );

You can also get the current camera angles in Options > View > "3D view angles".

- Michael