I was thinking it's a pain to have to move your mods back and forth when you want to play differant versions.

so why not have mods folders for each version? Example: .minecraft/versions/1.6.4/mods or .minecraft/mods/1.6.4 so that you can have different version with their own mods folder.

.minecraft/mods/{mcversion} already exists.

And if you don't want to use that, use the 'Game Directory' option in the profile config.

We will NOT be adding any other complicated stuff. These two systems are all you will ever need.

LexManos's post was interesting / useful because I didn't know that actually existed either... 

 

...But there is also another way: With the new official laucher you can also have multiple Minecraft folders (great not only for versions but for different mod pack on different world or for different servers).  That  feature has problems with versions older than 1.6.x (unless its been fixed recently) but MultiMC has finally update for compatibility with newer versions (I don't know about MagicLaucher since I never used it).

...But there is also another way: With the new official laucher you can also have multiple Minecraft folders

Yes, that is the Game Directory option.

I didn't know that thanks