While I think Big Baby can ultimately be a better player than Shelden, he is not yet proving it. And I am a fan of BBD.
Also, as we seem to be sorely lacking on boards, Shelden would help there. Especially against a long lakers team, I think Shelden could have added value on Defense and rebounding.
I wouldn't mind seeing a Shelden Rasheed combo or even a Baby / Shelden combo to see what kind of chemistry each duo has.
But one problem with Doc, he seems painfully slow to try anything unusual.
Most likely he will finally play Shelden on someone like Rashard Lewis in the 4th quarter with .10 seconds left and the Magic down one. I never understood that. He used to do it with Gerald Green and also with TA. Guy hasn't played like one second of the game in the second half and then he'll bring in TA completely cold to guard Dwade , the hottest guy on the floor with 5 seconds left. What?
Anyway, I agree with your post, I'd like to see some Shelden. I mean he's on your bench and he's a decent big, why not find a way to play him.