Honestly, SP is great! But I wish there was something more to it. To name a few things I propose to include into SP. 1. Wheel customization. Instead of bland wheel designs, make it so people can change more of the properties of the wheel. How thick the tires compared to the rims, the shape, design, etc. of the rims, and so on. 2. GLASS. This would be VERY useful to making vehicles look 10x better. An option where you can set a block to "glass", and it becomes transparent. And what color paint it is, becomes that tint of glass. (And also change the tint of the glass too). 3. Some sort of "Bomb bay" or "Hollow Fuselage" part. This would be helpful so much! not only for a "Bomb bay", but also for décor. Make the part a Half-pipe looking part. 4. More weaponry. I know this is quite obvious, but there really needs to be even more weapons. I don't know what exactly, maybe more gun types, or what not. 5. More fuselage editing. I thin this would be helpful, in the sense of, making awkward shapes, so designers can use less blocks on their creations.

That is all I can think of right now. I hope these ideas (Though I'm probably not the first to think of...) help Jundroo, or other community members be inspired to make SP even more awesome!