The 40/40 thing aided Canseco's MVP candidacy more than those others primarily because he was the first to get there. Plus his team won their division with the best record in the league. By the time Bonds and ARod and Soriano did it, the novelty was gone and their teams were not post-season contenders.Nobody has ever even gone 50/30 -- which he could possibly do.
Interestingly, of the 4 players who have gone 40/40, three of them didn't seriously threaten to win the MVP. Soriano in 2006 was 6th in the voting, Arod in 1998 was 9th in voting, and Bonds in 1996 was 5th in voting. Only Canseco (1996) won the award.
But I guess that's all messed up by steroids. 40/40 would probably be viewed as more of accomplishment today than it would have been back then given that the 40/40 guys were competing in an era where hitting 50 wasn't as special.
Being the first to do 50/30 or 50/40 could boost Ramirez's prospects, but probably much less so in a stacked field.