Introducing Plexer for Mac

[Jansyu]

Hi there, this is the first time I've tried multiboxing.
Have a mac running 10.5.8
Have two instances of wow setup.
Have configured plexer's preferences with 2 apps
Have enabled access for assistive devices
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Initially, both toons were moving in opposite directions ... well if one master went forward, slave went right angled forward, etc.
So then I tried the blacklist and white list
I tried to put my arrow keys (up down left right) into the list, couldn't
So I put my Clear (run forward) key in. yes, that went in to the white list, but when i used it on first toon, then stopped, 2nd one kept going? This seemed to do the same thing for the slave.
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I've checked all the notes, and there doesn't seem to be anything about this?

Can someone please advise on just how you use this program? I have the trial version at the moment. I just want to run my alts through quests with my main toon. So I'll only ever be dual-boxing.

TIA

Oh wait, tried using SHIFT+arrow direction key and that's worked. So now my directions are good!
Will test further.
/sigh now we're moving at right angles to each other again.
Looks like I'll need some advice after all.