You mean after the teamfight, when everyone is raging at eachother?
I think I understand how scripters do their work now...
by the time you finish unloading those extra fingers you'll be dead
That is all you need to do if you are Katarina

You clearly don't know how to play katarina. You are overthinking it.
Here, this guide will get you penta
Katarina is not nearly so complex. This is much more suitable in achieving pentakills: http://rsmg.pbsrc.com/albums/v627/wouterxL/faceroll.gif~c200
That is all you need to do if you are Katarina
lol wut? naw, as Katarina you just press R and get a penta, duh. somebody needs to l2p NOOB LOL