Ability to make summon entitys move for a certian amount of time

I think that you should be able to do a command like "/summon pig ~ ~ ~ {NBT} {moving} {direction} {speed} {time}" (you would be able to just tap space instead of typing NBT data if you dont want to)

this would make it ALOT easier to make things such as custom maps or weapons. It also would be that just like effects if you put the max number it would just be infinite.