All right, I'm gonna try to do this for a few periods here. I'm not going to count short-handed points, as I guess that skews it a bit towards offensive players who kill penalties (also I'm too lazy). The NHL.com site only has ES / PP / SH division of points going back to 1933-34, but that's probably a good place to start anyway, since from roughly that point we have a fairly stable set of rules, sizes of rinks, etc. (at least compared to prior).
So, to begin, this is the best I can do (apologies if any errors or oversights) for the...
Top ES point-scorers per game from 1933-34 to 1944-45 (min. 100 games played):
1.07 Maurice Richard (note: only 112 games played)
1.00 Bill Mosienko (note: only 114 games played)
0.99 Elmer Lach
0.94 Bill Cowley
0.90 Ted Kennedy (note: only 100 games played)
0.84 Syl Apps
0.81 Doug Bentley
0.81 Roy Conacher
0.80 Buddy O'Connor
0.78 Ab DeMarco Sr. (note: only 116 games played)
0.76 Toe Blake
0.76 Bryan Hextall Sr.
0.76 Gordie Drillon
0.76 Max Bentley (note: only 122 games played)
0.75 Milt Schmidt
0.75 Joe Carvath
0.74 Bobby Bauer
0.72 Clint Smith
0.71 Sweeney Schriner
0.71 Billy Taylor Sr.
0.71 Syd Howe
Someone who knows more than me about this era could interpret these results... Basically, as you'd expect, the "young guns" who played only a few years into the mid-40s, and particularly those (Richard, Lach, Bentley) who feasted on the war-weakened League early in their careers, do very well here. Conversely, someone like Milt Schmidt, who fought in the war, probably looks a bit worse than he would he had played right through those prime years (he still does very well).
Charlie Conacher doesn't make the list (quite), but I suspect he would if the available stats didn't cut off a couple of his early prime seasons. His brother, Roy, does very well here.
Of course, my cut off point of 1945 is arbitrary, and it cuts right into the primes of people like Elmer Lach.
Anyway, it is what it is...