Technical Question about macro spam

[Zerol]

So the issue is I find it highly annoying when using my macros (Mainly Canni), on a shaman that I get the: "You can't use that command while casting..." message.
And was wondering if there was any way to remove this error message, besides moving the "Others" filter into a spam window, which will also put Considering, faction etc in there as well.

So if there is any way to remove this spam I would be most pleased.