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I have a simple and private addon that colors the border of item tooltips red when is basically no usable by the player class.
I have been going though the code and found that TipTac is using hookmagic to simply enforce it's own options.
Is there a simple and direct way to set the game tooltip boarder color with out TipTac overriding it?

Yes, you can use the following snippet:

if (_G.TipTac) then
	_G.TipTac:SetBackdropBorderColorLocked(tip, r, g, b, a);
end

finally figured that out - but also found out i have to load after TipTac for it to work for some reason.

Probably has to do with the hooking order, which addon sets the border at last.