Advanced game settings

Can developers create advanced game settings for skirmish/hosted games?

Like would it be possible to increase or decrease the base value of the following attributes by any percentage for a game?

  • Resource gather speed
  • Train time
  • Build time
  • Natural resources
  • Movement speed
  • Damage
  • Unit hp
  • Healing
  • Building hp
  • Reapair speed
  • Repair cost

And save different settings

I would like to try different things with these.