Question for LAGs

If you run up against a player who lets you do their betting for them, how do you adjust your play? By "lets you do their betting" I mean, lets you take control of the betting when they have a good hand.

At low limit hold em that equates to someone who is passive and probably folds the best hand unless they are quite confident. As a LAG you do on occassion lose some money to slowplayed monsters, but you just take a note on their passivity and keep playing.