I really support retreating option of defender forces. Attacker side can already stop its assault while defenders just have to continue fighting unless attacker decides to stop attacking.

Upkeep codes do exist in the Triplea but there is no fractional numbers but still possible to assert decent upkeep rates to every units for preventing stacks. Just need to increase the cost of everything like tenfold or twentyfold then appointing upkeeps to units. 1 Pus upkeep per round for infantries would be reasonable since infantry cost would be 30.

Huge stack are bigger issue than balance this just incredibly annoying and time consumption. Dice at least suprass it relatively but big stacks always grow in big maps and it slow downs games.

The only solution it assisting really good upkeep values to every units but it should be really low (for example 0.1 upkeep for infantry). Obviosly one infantry should require less upkeep than bomber. Mobile and expensive units shoud require higher upkeep.

NWO unit costs even ecourage more stacks since infantries are too cheap whereas artilleries are expensive and there is no tech.

No retreat feature would totally cancel some tactics like combine strike (attacking enemy stack and retreating then your ally attacks the same enemy stack and destoy) and tricky movements (collecting units to a single stack by attaking neutral territory than retreating).

LL is simply too bad for any big maps after round 1. One miscalculation totally destroy whole game.

Obviously dice is better choice for big maps but I really don't recommend dice for the first round of NML. Go LL in the first round then swich to dice it is more fair.

Dice also would give significant advatages to Allies. I would recommend giving a few bonus to Axis/Centrals in dice games.

Also these kind of stats are not enogh to reflect realities to a realistic valued Triplea scenarios. In Triplea sense your allies and enemis are always constant, you have also unlimited manpower and public support thus in this sense you can start games with demanding unconditional surrender from your opponent.

For example with realistic values Japan would have no chance aganist USA since its economic/military power roughly 5-10 times smaller than USa but they would have forced USA to negotiation table by making Pacific front coslty as much as possible.

In Triplea your aim is simply steamrolling Allies with Axis Japan but Actually Japan's aim was just convincing USA to lift oil embargo.

Even determining exactly the most realistic values to countries would be simply meaningles in any scenario.

-There was no 2 side like Axis or Allies in WWII. Allies countries were fighting against the same countries on papar but also they was working and acting against each other. Even after the attack on Parl Harbour. USA didn't commit its total power to win because their another aim was destroying Britain by increasing the depenency of the US. Leand lease was also part of this plan. If they had just wanted to defeat Germany, they would have simply join the war much earlier.

UK also together with USA, pretty much capable of invading France much more earlier but they simply wanted to see Soviets destoyed by enormous casualties. The aim of the invasion of Normandy was saving France from Soviet advance rather than defeating Nazism.

How can I do it with a national objective or trigger?

I want to make invaders to obtain only half of the values of occupied areas is that posible?

Armours have already minimal roles in most of big maps and it would even worsened inf spawn issue. Because the main problem is better stats are no better than cheap cannan fodders in most cases since fighters are already provide enormous ground support also unlike tanks they can't be destroyed regularly.

I would accept it only if slow units also get some penalties in bad terrains.