If you know how to hit a good kicker that kicks outward on the Ad side (right handed players here), you can telegraph it all you want. If you watch players with big forehands (e.g. Federer), they'll stand in the middle of their backhand side to serve out wide. We know they stand there to hit a forehand as their first shot and we know they'll serve over 80% of their balls out wide, but they do it anyway. The only reason they don't openly show where they'll hit is to prevent their opponent from cheating over too much -- they still have the option of hitting down the T if they exaggerate.
The whole point of that Ad court wide kicker is to force your opponent to make contact with a very bad court position (it likely will also be in a bad posture since he has to step sideways a lot to hit that ball).
For the comments above, I always toss the ball further back for kick serves. People could foretell what I will be doing, but if I make a good contact, I'll likely be happy with the results anyhow. With that said, I know that I could improve my disguise very easily by moving my flat serve toss further above my head -- like Federer, for instance. You just have to mess up a kick serve to turn it into a flat one, so I'll see if I can mimic Fed's disguise.