The first time i will suggest

1:XYZ cords/rotation can be changed via Settings so it can be like those ones on SR2/ Simplerockets 2. So it can ease out our job at moving cords without having to click the button and predict its potential cords

2: Changable Fuselage materials. It can be a good thing for planes that uses different material for its fuselages like the ekranoplan with steel structure for strength and health. Again it can be configured what is the default material for Fuselages. The weight, health and bouyancy changes for every matterials
Heres some example Fuselage matterials:
1: aluminium A light material good for small light craft, low health 400 health per 1 unit
2: steel A material with good strength, good for big scale crafts used for armored crafts 550 health per 1 unit
3: Carbon Fibre A strong material that is used for armored crafts, very light 870 health per unit
4: Fiberglass A Cheap material usually use in gliders and other light crafts 120 health per unit
5: Titanium A strong yet heavy metal, Very good at protecting insides, very good armor 1450 health per unit
6: Secret material A strong material VERY light, good armor 5500 health per unit
7:Stainless Steel A strong material, pretty heavy but its a good protector 950 health per unit

3: More weaponary
New weapons with different styles, (mostly missiles)
New Missiles:
1: Dagger A powerfull missile, but short range
2: Flinch simillar to inferno but less explosiver and longer range, good for destroying small targets
3: Smite simmilar to cleaver but with even more damage and better turning range
4: Neoplasma A strong missile capable of ruining tons of ships

Unfinished im going grocery
4: Pre-made subassemblies
Good if you're bad at the game and love pre made planes