Is the crossover point a problem for Shakehanders?

Maybe the original question was supposed to be about penholders?  I've seen some argument that penholders don't have crossover points, but I've never heard anyone say shakehanders have no crossover points.  Even at the top level you can sometimes see this come into play.  When one player has a short and high ball to attack, they often go straight for the opponent's armpit.  Even if a top player manages to hit a decent forehand shot when the ball is in their crossover point, it doesn't mean the crossover point is irrelevant - because they could have hit a much stronger shot if the ball was more clearly in their forehand or even backhand wing. 

At my level (average club level) it isn't such a big factor but mostly because most players don't take advantage of it, and also the pace of the rally is so slow.  However, it is something I am always very conscious of.  I especially like the fast long serve at the crossover point.

There is a guy who  always serves a tomahawk serve into my crossover point .

at the start of his serve it seems that his serve will come into my backhand zone but eventually it curves a lot and ends up as a half long serve at my crossover point.

I am often caught off position if I play a forehand topspin ,as when I lift the ball he is ready on his forehand side to hit a winner . 

Any suggestions on how to overcome this problem ?

I would use my backhand on this ball.  It is easier to deal with the tomahawk serve and easier to hit it over to his backhand.  Even if the ball is a little bit on the forehand side still give it a try.

will try that …

thanks Alois