Can sumone explain to me how can I make Radiant 1.5 work like 1.4?
My problem is in editing Verticles.
When I have a brush. And I try to move one Verticle downwords (with respect to Z axis)
It moves some other Verticles too 

As u can see on this picture.
The Verticle on the left of the moved one… Was moved too 
In Radiant 1.4 it splited faces into triangles which was very convinient to me, and made editing terrain or anything nice, and easy…
Is there a way to setup Radiant 1.5 to split planes to triangles when needed???
(like in this situation…)
EDIT #1
I even found it in preferences in GTK1.4

But in GTK1.5 there is not such option 
