One note on Rupasinghe's suggestion for the southbound DVP off-ramp. If you banned/blocked left turns, I feel like it would be faster for cars to get off at the Wynford exit, rather than performing a U-turn at Gervais.
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You'd save 1.1 km in distance travelled, and avoid both the Gervais light and the Wynford station crosswalk light (and the northbound off-ramp light he wants to eliminate). You'd hit the Wynford exit light, the Wynford/Concorde light and the two Wynford/Eglinton lights, but perhaps those could be synchronized so you only hit one or two.
This route is also shorter than the existing left onto Eglinton from the DVP off-ramp, though I haven't timed what the comparison is.
My apologies if this has been noted before. I couldn't find anything recent in a UT search.