I've tried Stanley dry wall saws. Good on kiln dried pine, not so much on green wood, and lousy on hardwood.

What I'm thinking of would look like a small cross cut saw, square tipped and about an inch and a quarter wide, but with a handle like a keyhole saw. Basically the love child of a keyhole saw and a laplander. Stanley makes a keyhole with a d-gaurd type grip, but it is is very skinny and flexible- I want a beefy one. :P