nc7 - I've worked and tweaked on the formula and idea. I feel like this really puts emphasis on higher usage players without separating them out by tier.
efg%# = (2*usg/100-0.12)(efg-49)(10)
efg%#m* = (2*usg/100-0.12)(efg-49)(min*1.02/3936)(10)
I've created a spreadsheet with every player in the WIS database with an efg% of 54 or better. That took quite a while, but eventually I plan on putting everyone with an efg% of 49 or higher in there... but we're already talking 1500+ players at this point. The spreadsheet takes forever to load as it is now.
top 25 in efg%#m* is:
Chamberlain, Wilt 66-67 76ers
O'Neal, Shaquille 93-94 Magic
Barkley, Charles 87-88 76ers
Abdul-Jabbar, Kareem 71-72 Bucks
O'Neal, Shaquille 94-95 Magic
O'Neal, Shaquille 04-05 Heat
O'Neal, Shaquille 99-00 Lakers
Abdul-Jabbar, Kareem 70-71 Bucks
Barkley, Charles 89-90 76ers
Abdul-Jabbar, Kareem 79-80 Lakers
Howard, Dwight 10-11 Magic
Malone, Karl 89-90 Jazz
Gilmore, Artis 80-81 Bulls
Howard, Dwight 07-08 Magic
O'Neal, Shaquille 98-99 Lakers
McHale, Kevin 86-87 Celtics
Howard, Dwight 09-10 Magic
Stoudemire, Amare 07-08 Suns
Gilmore, Artis 81-82 Bulls
O'Neal, Shaquille 00-01 Lakers
Barkley, Charles 88-89 76ers
Howard, Dwight 06-07 Magic
Gilmore, Artis 71-72 Colonels
Chamberlain, Wilt 67-68 76ers
Barkley, Charles 90-91 76ers
Taking minutes out of the equation (possibly very useful for non-exclusive/non-draft leagues):
O'Neal, Shaquille 04-05 Heat
O'Neal, Shaquille 05-06 Heat
Dawkins, Darryl 85-86 Nets
O'Neal, Shaquille 10-11 Celtics
O'Neal, Shaquille 97-98 Lakers
O'Neal, Shaquille 93-94 Magic
O'Neal, Shaquille 06-07 Heat
Chamberlain, Wilt 66-67 76ers
O'Neal, Shaquille 94-95 Magic
Barkley, Charles 87-88 76ers
Stoudemire, Amare 07-08 Suns
O'Neal, Shaquille 01-02 Lakers
Barkley, Charles 90-91 76ers
Novak, Steve 10-11 Spurs
Novak, Steve 10-11 Mavericks
O'Neal, Shaquille 98-99 Lakers
O'Neal, Shaquille 95-96 Magic
Johnson, Steve 82-83 Kings
Gilmore, Artis 80-81 Bulls
Gilmore, Artis 81-82 Bulls
Davis, Walter 78-79 Suns
Howard, Dwight 10-11 Magic
Howard, Dwight 09-10 Magic
Gatling, Chris 95-96 Heat
O'Neal, Shaquille 08-09 Suns