Navigation like a CAD (zoom with mouse wheel without pressing CTRL)

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Hello,

I love Dia to draw UML diagrams!

But i miss one thing: A navigation like a CAD.
This means: The mouse wheel should not scroll up/down, it should zoom to 
the point which is actually under the cursor.
I think it's quite easy to implement this, because the CTRL key does 
exactly what i want.

So, it would be great if there was an checkbox in the "view" menu, like 
"Zoom with mouse wheel".
If this checkbox is activated, it should be like the CTRL key is pressed 
all the time.

Sorry for my bad english, I hope you understand me :-)

Thanks