How to save a png with a straight or fat alpha?

Long story short, work in broadcast and a new piece of gear prefers png files.  I know how to save png's with a transparency, that's not the problem.  What I don't know how to do or if it's possible is to save them with a straight or fat alpha.  Right now we feather or extend the edges out past the alpha of say a logo and save it as a tif, psd or .tga.  That way once it's keyed over video or whatever, the edges look good, no black bad edging.... this makes sense, probably not explaining it very well.   But switching to png files I have no idea how to make a straight or fat alpha since it sees transparency.  I mean if I feathered out the edges, a png will see that correct, since there's no alpha??
I hope this makes sense ?

Chris, this is probably the answer I seek "PNG always saves with straight color - that's how the PNG spec defines it." 
I admit my explanation was a bit weak and I understand PNG only supports transparency, which is not an alpha,  and the apps aren't treating them wrong....I just couldn't formulate an intelligent question and explain it, my bad.
After thinking about it I don't think using a PNG will work. RIght now for broadcast gear/applications if we don't fill the transparent and semi-transparent areas of an image with the colored part of the image, we usually end up getting a dirty key/matte or a lot of fringing.  So when using a .tif or .tga that reads an actuall alpha, we can fix the issue by doing what I described.  In fact we use a quick little plugin from flaming Pear called "Solidifty" to speed up the process http://www.flamingpear.com/download.html .  With that said, I know we can't do the same steps with a png because it only sees transparency, but I guess I was wondering if there was a work-around or a trick to fix that issue.  I could be wong, but doesn't a png save with white ?
But again, as I thought about it, I think i'm asking for something it's not meant to do, but I thought I'd ask anyway.
Thanks Chris, does this make more sense or more confusing?  The bottom-line is I don't think it will work.

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