I have a '10 TE and immediately swapped out the the "Camry tires" for BFG All Terrain TA KOs (C load range). The in town driving dynamics I feel are better now than with the OEM tires. Of course, the off highway stuff is much better obviously. I'm now running studded Goodyear DuraTracs for the winter. (Or I will be when Toyota can get me the other two steel wheels I've been waiting for for the past three weeks. Nothing like looking at a set of studded tires in you garage when the weatherpeople are telling you its going to snow tomorrow :bash
I think after having a spring, summer and fall of fly fishing and overlanding in my TE that the KDSS is worth the money and the wait. The handling on pavement alone makes KDSS worth it irregardless of one's dirt aspirations. Here in Portland, Oregon my dealer had to spend about 9 hours working a 3 dealer trade to get my TE with KDSS and Nav. There just were not that many out there at the time. The dealer I purchased from worked much harder than the two closer ones I tried first to get me what I wanted. You need to find the best dealer in that respect in your general area and let them get it done. If you need to wait a little while, it will be worth it for that combo on your T4R.