I just slapped this together to test the Ctrl+L script - made a bunch of curves, then EXTRUDE.

I supposed one follows this procedure:

1. Select FILLET
2. Select two (2) curves
3. Ctrl+L
4. Hold the SHIFT key down and click somewhere?

Cheers!
Great software - certainly compared to 3dCoat - which - despite Chipp Walters helpful clips - is difficult to learn!
Maximus