I always had 2 questions about the balance in the original game and the mod too.
1) Difficulty "Hard" - the player has a standard amount of ammunition. Difficulty "Serious" - double ammo. Many players, including myself in some places, believe that this makes Hard difficulty more difficult. There is a proposal to make the amount of ammunition standard on all difficulties. But the maximum amount of ammunition for weapons is doubled as on maximum difficulty. That is, the ammunition for the tommigun will give 50, and the maximum ammunition will be 1000.
2) In the later game, the minigun makes the tommigun little or even unusable. I have an idea to fix this by using different ammo for the 2 weapons. That is, two types of ammunition - 2 weapons. This is the ammunition system in Serious Sam 4.