saubhikr, if you are going to say that my 4 Qg4!? idea isn't that good, I would like to see your analysis because I have analyzed it and it seems to me that White gains a slight advantage in all lines.

After 4...Kf8 5 Bxd6 Qxd6?! (Fritz 11 prefers 5...cxd6 but after 6 Nc3 judges the position as +=) Fritz 11 likes 6 Nc3 over your given 6 Qe2?! and judges the position as +=.

I think I may come up with a novelty in the London System. After 1 d4 d5 2 Bf4 e6 3 e3 Bd6, Win with the London System recommends 4 Bxd6 and after 4...cxd6 they recommend 5 Nf3 leading to a slight advantage for White but I think Black has improvements to the game given that should give Black equality. They also mention 5 Qg4!? and after 5...Nf6 6 Qxg7 Rg8 7 Qh6 Rg6 8 Qf4 Qb6 they say "Black may have enough compensation for the pawn here" and I agree. The improvement I think I have come up with is 4 Qg4!?. Fritz 11 originally thinks Black can equalize against this with 4...Nf6 and after 5 Qxg7 Rg8 6 Qh6 it origianlly thinks Black can equalize with 6...Rg6 or 6...Nc6 but after a few more moves changes its assessment to +=. Fritz 11 also origianlly thinks Black can equalize with 4...g6 but again after a few moves changes its assessment to +=. Black can also try 4...Qf6 after which 5 Bxd6 cxd6 transposes to a line from Win with the London System where the authors think Black should be able to equalize but after 6 Qg3 e5 7 Nc3 Ne7, Fritz 11 thinks White can gain an advantage with 8 e4!?. What are your thoughts on all of this?