Would adding a few ounces of acid malt to a sour mash(us05 yeast) help supplement it? Or would it be a waste of the acid malt
A few ounces would probably be useless. If you have acid malt that needs to be used up, go ahead and do it.
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what about half a pound? Would the sour mash benefit from it and help aid it?
A sour mash is organically soured. If you're adding acid malt there's no significant reason to do a sour mash.
i thought the sourness is different, some claim straight acid malt is one dimensional
A lot of people think the organic flavor of a sour mash is nasty. A sour mash done correctly should be fairly clean in flavor. It's not going to be comparable in terms of sourness or flavor to something soured by age.