Create a line between two vertices...how to?

[aza]

Hi there.
Is it possible to create (insert) 2 vertices and connect them together?
I'm not talking about snapping but really creating a new face.

For example...i create a cube.
Select the top and bottom 2 vertices and choose "insert vertex".
Now between these 4 vertices...2 more are created.
Now i want to select the new top vertex and the new bottom vertex and connect them so a new "edge" is created splitting the face into 2 faces.
I did manage to create a line between 2 vertices but although it looked like it...it actually didn't create a new face.

Help is much appreciated.

ps. i also saw bolleans re in the plu-in pack?
How can i boolean substract in the demo?

Thx ,
Aza