im using the trax editor and it seems to be very good, why do a lot of people keep saying its a load of bollox?

anyway, question
when u insert a clip, u can right click on it and it has an option to activate keys
what does that do? is it helpful?

and say, i have a clip of my character running across the screen (right to left), then i want him to turn around and run across the screen the other way (left to right) can i use the same track? cos all the translate keys wud be different wouldnt they? :S im confuzzled