Yes, yes it is.  Johnny Fang gave this answer on an internal thread recently and I thought I'd share:

"The templates are in C:\Program Files\K2 blackpearl\Bin\Layouts\clientevent\CSharp\1033 

Make a copy of the “Blank Page” folder and rename it to whatever you want it to be named.

 

You can then proceed to make modifications to the layout.aspx and class.aspx.cs files to suit your needs.  Just keep the $..$ tags in place.

 

Run the form gen wizard again and you will see your template in the list."

 

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