Set Registry doesn't include manager and post playing days cards? Why?

I collect a lot of sets for my favorite players. I've been buying manager cards and various post-playing days cards. I recently found out that those cards aren't included in the set registry. Why is that? Is there a way that will change?
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Comments
I think your best bet is the sets that you create and define yourself. Something like a Joe Torre playing days and managerial card set could be kinda cool.
<< <i>Gee, that was helpful. >>
Never complain about receiving a 1-word answer from Lee ....
You have been spared
PoppaJ
<< <i>cause people who collect Mickey Mantle master registry sets don't want the several thousand modern cards to buy >>
Mickey Mantle was a manager?
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
<< <i>
<< <i>cause people who collect Mickey Mantle master registry sets don't want the several thousand modern cards to buy >>
Mickey Mantle was a manager? >>
Try to read the whole post before trying to make a wise crack, directly after saying manager cards he clearly mentioned various post-playing day cards.
While current and former players have countless cards made every year now, it doesn't mean Eddie Mathews and Ted Williams did when they were managers. If various post-playing days cards were included it wouldn't have to be thousands of them
Anyways, the correct answer was already given in the first reply
Having said that, I think regular issue set manager cards are a different thing altogether. He's also right about the idea of just doing an informal set for guys like Torre, Berra or Frank Robinson. I don't know anyone who would bother to have a player set of guys like Gil Hodges or Ted Williams and not go after their managerial cards.
Outstanding Lou-Tram avatar, by the way. They should each be in the HOF.