Players with a 50/40/90 season:
Larry Bird 86/87 and 87/88
Dirk Nowitzki 06/07
Reggie Miller 93/94
Steve Nash 05/06 and 07/08
Steve Kerr 95/96
Jose Calderon 07/08
Mark Price 88/89
Billy McKinney 80/81
So, Larry was not the first player ever who averaged these numbers, Billy McKinney was. Actually, McKinney had a 50/50/90 season in 80/81, but just like Steve Kerr 95/96, who also had a 50/50/90, he only averaged ~8 points in 30 minutes. So Larry was the first No 1 option to ever achieve that feat.
Cuz I have no life... I just looked it all up:
80/81 - Billy McKinney: .532/.500/.917 - 8.4 points (only 1/2 on three pointers... You can't really count him. 44 Free Throws)
86/87 - Larry Bird: .525/.400/.910 - 28.1 PPG (90 3P / 414 FT)
87/88 - Larry Bird: .527/.414/.916 - 29.9 PPG (98 3P / 415 FT)
88/89 - Mark Price: .526/.441/.901 - 18.9 PPG (93 3P / 263 FT)
93/94 - Reggie Miller: .503/.421/.908 - 19.9 PPG (123 3P / 403 FT)
*95/96 - Steve Kerr: .506/.515/.929 - 8.4 PPG (122 3P / 78 FT) *shortened three point line
05/06 - Steve Nash: .512/.439/.921 - 18.8 PPG (150 3P / 279 FT)
06/07 - Dirk Nowitzki: .502/.416/.904 - 24.6 PPG (72 3P / 498 FT)
07/08 - Steve Nash: .504/.470/.906 - 16.9 PPG (179 3P / 245 FT)
07/08 - Jose Calderon: .519/.429/.908 - 11.2 PPG (79 3P / 109 FT)
And currently on Pace this year:
08/09 - Jose Calderon: .510/.464/1.00/ - 13.3 PPG (51 3P / 83 FT)
08/09 - Ray Allen: .504/.416/.936 - 18.1 PPG (112 3P / 131 FT)
Anyone else missing from that list that hasn't been mentioned? And wow... Calderon hasn't missed a free throw all year??