• More fuel tanks for custom missiles (higher and more fuel)
• More different engines
• Able to paint parts of custom missiles
• extra slot in custom missile table:
  
  Slot name: addon slot
  
  for example:
  
  an addon named flare:
  
  if the missile gets targetet by turrets or so, it would automatically flare ("drops" fake targets) so the turrets cant destroy the missile easyly
• customisable warhead (similar to custom nukes)
• missile can fly to othee planets (advanced rocketry) if it has enought fuel

whats wrong with that

For one, this is a place for ISSUES, not suggestions, and HBM normally doesn't take suggestions in the first place

but why not Suggestions

because most suggestions are dumb
just like this one