Python Scripting, add hotkey with map type Mouse? I want to add a hotkey by script. The regular Addon tutorial mentions how to add a normal hotkey. But i need a Map Type Mouse, left mouse button, with holding down a modifier key. And i run into trouble here.

My current code is

kmi = km.keymap_items.new("view3d.paint_select", map_type = 'MOUSE', type = 'LEFTMOUSE', value = 'PRESS', key_modifier = 'I')


And i get this error: 

TypeError: KeyMapItems.new(): was called with invalid keyword argument(s) (map_type), expected (idname, type, value, any, shift, ctrl, alt, oskey, key_modifier, head)


map_type is missing in the expected list of keywords. But where else should i put it then? Is map_type not part of KeyMapItem?
Shift+LMB example to toggle Properties > Scene > Simplify:

import bpy

# operator
class ToggleSimplify(bpy.types.Operator):
    bl_idname = "view3d.toggle_simplify"
    bl_label = "Toggle Simplify"
    bl_options = {'REGISTER', 'UNDO'}

    def execute(self, context):
        context.scene.render.use_simplify = not context.scene.render.use_simplify
        return {'FINISHED'}

addon_keymaps = []
# register
def register():
    bpy.utils.register_class(ToggleSimplify)

    # handle the keymap
    wm = bpy.context.window_manager
    kc = wm.keyconfigs.addon
    if kc:
        km = wm.keyconfigs.addon.keymaps.new(name='3D View', space_type='VIEW_3D')
        kmi = km.keymap_items.new(ToggleSimplify.bl_idname, type='LEFTMOUSE', value='PRESS', shift=True)
        addon_keymaps.append((km, kmi))

# unregister
def unregister():

    for km, kmi in addon_keymaps:
        km.keymap_items.remove(kmi)
    addon_keymaps.clear()

    bpy.utils.unregister_class(ToggleSimplify)

if __name__ == "__main__":
    register() 


Also see: https://www.blender.org/api/blender_python_api_current/bpy.types.KeyMapItems.html