Very interesting proposal! Not a big fan of emphasising the points though, I have a feeling it'll help streaky shooters on bad teams.
But indeed the question here is more about what you expect from your fantasy games. Most people treat them as mindless fun, which is fine as long as they don't involve me
Myself, I'm trying to simulate the sport as well as I can, because I want to feel like a true GM.
My system (scored on Fantrax) is this:
Rough ideas behind it are: strongly emphasise +/-. This mean punishment for minutes on a bad team. Minutes on a good team are a positive indication. Also, to bring some spotlight onto the top defenders, punish those who take bad shots. Compared to standard Fantrax settings, I'm happy to report the changes in FP/G ranking for the NBA All-Defense Team members:
Thabo10: 181st to 148th.
Battier09: 104th to 75th.
Battier08: 88th to 62nd.
Bell08: 93rd to 72nd.
(In case you're curious, this is a part of my big project: the most realistic league ever. Apart from this kind of advanced scoring, we're also trying to follow the CBA as closely as possible. And since not many people have any idea about the latter, I'm still looking for more people and you could join here: http://www.profsl.com/smf/index.php?board=1034.0