It's not as cool as what the iPhone 41CX emulator will include in the next update, but I didn't want to wait till the next release, to have user templates.
So, I just created a 2nd instance that uses the custom template. It's kind of nice because it doesn't take any more steps than the final version. It takes 2 clicks to change templates, and the state of the calc is maintained, so you don't lose any work in making the swap.
Here is a video showing how it works The Video
PS: Not crazy about the distortion in my camera lens in macro. :-(
Edited: 26 June 2008, 12:48 p.m.