Yeah, there's real gold in those negative values.

Also, if you have 'morph injection' packs for a variety of figures from a common line (the millenium 3 figures are the only ones I know of, but maybe the G2s can do this too) you can sometimes inject an expression or morph from the 'wrong' figure in. Use it at a low setting and get some unusual results.

I recently put Freak claws on Aiko this way, but I have also used it to make expressions and faces.

Espression packs from the wrong figure, in fact almost any figure if they are just 'dial settings' and not injections, can be used like this if you apply them, spawn a morph target, and then dial that in at a low value. Too high and you'll see just why it is the 'wrong figure', but it can be good for building up a subtle combination.

Truth has no value without backing by unfounded belief.
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