Add 8-direction behavior on a sprite,
then use action to set it ignoring input.
Failed, you can't ignore 8d input.
You can slow it down, but the sprite still moves in acceleration.
I just amended the built-in example '8 direction 6 (spawn position).capx' and told it to ignore input on Right Mouse, and it worked fine.
Maybe if you post your .capx (as you really should when reporting a bug see HERE) then someone will have a better chance of helping you.
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I just think it's too obvious to even make a capx.
http://dl.dropbox.com/u/31590694/ScirraBugReport/8dirCantIgnore.capx
Left-click the sprite, ignore it's input,
then, press your arrow keys, don't release too fast.
See, the sprite runs again ~~
Ah.I see it now. I would normally not leave the key held down so long, that's why it seems OK at first.
Let's see what Ashley makes of it.
Oops, it's a bug. Fixed for next build!