Only 1 1/2 years later, at appears that the ability to make reservations at SVC properties through Travellers Plus is now available online. I was able to check for a room at Carriage Hills for rememberance day, and see that there was availability and the number of points. Go to direct exchange, select connections, and then click book today on any of the available properties.
Keep in mind, that you may half to turn off your popup blocker for this one, as it opens up in a new window like the RCI portal. But it is there! This is one of the primary reasons I have stayed away from this feature, is I hated having to call everytime I wanted to check availability. This will indeed simplify my life!