The most incredible ideas that made my hair stand up in the back of my neck were:
The use of AARHE “four times rule” which says you can build units not exceeding 4 times the IPC value, so if you have India factory you may build 12 IPC worth of product.
The other idea is they recommend subs at 6 IPC and transports at 7 IPC which is what we have in AA50.
Also, they add a few ideas about fighters defending against SBR ( its similar to the rules in AAE)
Technology with advanced AA guns hitting at 2 rolls of 1
Mech infantry rules 2-2-2-4 unit
SS Panzer rules: att 4 def 5 cost 10, Guard Armies etc…
Rules for Airborne and air transports seems like AA50
Rules for heavy tanks
Rules for neutrals and how you get them
Rules for tech development: you roll one die at a time if you roll 1-5 thats exactly what you pay for the technology, if you roll a 6 you get it, the main point is you don’t have to commit to the number of rolls… you can do one at a time and pay each result before allocating a new roll to try again paying the amount you rolled. This is a great idea!
Some other ideas seem plausible.