Another thread reminded me to update this, so here it is;
In regard to integrated signals: Legal.
(1) Prescribedlamps and reflectors shall be inspected and tested and,
(a) each circuit shall light the filaments of all lamps on the circuit when the appropriate switch is in the “ON” position, and each indicator lamp shall indicate correctly;
(b) the operation of any lighting circuit shall not interfere with the operation of any other circuit;
(c) each lens and reflex reflector shall be correctly installed and shall not be discoloured or missing in whole or in part;
(d) each lamp and reflector shall be securely mounted on the vehicle and none shall be missing;
(e) the turn signal lamps and the flasher unit shall operate properly;
Reg 611, Schedule 6, s. 6 (1)
Now the key word of contention was/is prescribed, and according to the MTO representative I spoke with that simply means "as prescribed in the HTA" which is defined as;
Lamps required on motorcycles
(2) Subject to subsection (3), when on a highway at any time every motorcycle shall carry two lighted lamps in a conspicuous position, one on the front of the vehicle which shall display a white light only, and one on the rear of the vehicle which shall display a red light only.
R.S.O. 1990, c. H.8, s. 62 (2).