@rockrobinoff:
In short, do you want to risk what could potentially be the whole game on 70% chance of success, where even if you win (admittedly, it quite nice) its not game deciding, and you have other perfectly good and less risky options?*
If you do not even attempt to attack Egypt, Italy’s growth in Africa will be stunted, at least, if they are not outright ejected from Africa altogether in the first few turns.
Russia
I like 10 inf first buy when Germany ignores Africa, and pulling out of Karelia (typically into Finland, but not always) when G goes North. If G goes for Africa, the pressure is slightly off, so a couple of tanks (or maybe a plane) and inf. I also like propping up China with Russia if Germany is not 100% focused on Russia. Such options become available when Germany attacks Egypt, or buys Navy.
I have come to the conclusion, definitely not an original idea, that Russia should be immediately aggressive toward Germany with the goal being to make Germany taking Karelia a bloodbath that they can’t afford. If Germany is allowed to earn near 50 or better consistently in the early part of the game, it becomes nearly impossible for the Allies to slow them down without leaving Italy and Japan largely unchecked.
My builds would depend on whether it would be possible to defend Karelia from a G2 attack and how many casualties Germany took in their opening attacks. I’m leaning toward 5 inf, 3 arm if Germany moves heavily into Bst and 5 inf, 1 arm, 1 fig if they didn’t and you can try to hold Karelia. Although, there is a special place in my heart for the 6 inf, 1 bmb build with the bomber placed in Cauc to threaten an undefended Japanese TP in sz38(props to axis_roll for that one).
I, too, like to prop up China with the Russians or at least to try to hold the line in Chinghai using mostly the Siberian inf(sometimes more) with a small 3 inf force acting as rear guard to conduct a fighting withdrawal to prevent Japan from just blitzing through all of those territories.
KIF?
My plan is usually to neuter Italy in Africa and then go after Germany.
I have no idea if USA can split it’s attention between the Atlantic and the Pacific. Perhaps it has to?
The only possible split is to harrass the Pacific with a small force(most of which is already there) to tie up a larger portion of the Japanese fleet and everything else being spent in the Atlantic for the rest of the game. Other than that, pick one side and go with it. Splitting the US income is usually wasteful.