Before I get in trouble - The whole purpose of a BOV is to eliminate compressor surge (that is to stop pressure build up in the intake system to travel back to the turbo's compressor wheel). Other than that... you're looking for a nice scary whoosh everytime you pull up behind a slow driver right?
Now the problem with diesel engines is that they don't have throttle plates to control engine speed - where as a petrol engine has a butterfly valve in the throttle mechanism (as Mullett pointed out). That just means that engine speed is controlled by regulating the amount of fuel injected into the cylinder during the power stroke. Also, I think modern diesel engines have the fuel injection electronically controlled. Btw, any modification that raises the amount of fuel and air put through a diesel engine will increase its operating temperature - might just mean a shorten life span on your engine.
Now, if you want to sound intimidating, you could go for a dump valve simulator... But like you asked, is it worth while? No, unless your showing off. Can a BOV be fitted to a diesel engine? No... sorry. Spend that money on another gift for your car.
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