This seriously needs to happen. Neither ZSS nor Samus players like being shackled to the other character.
What do you mean by shackled?
I must be in the minority, because I at least like having the ZSS option through Taunt button mashing. And I seriously hope that by mashing it while in ZSS, I can go back to Power Suit form.
OH, you must mean that after the Final Smash you are forced to play as ZSS/Samus?
If that's the case, then yeah, I dislike forcing transformations on you (see: Pokemon Trainer's switch cycle, and fatigue system).
But I would really love the OPTION to turn from one to the other to remain via up+down+up in the D-pad.
Regarding the "Zero Laser", I hope they iron out that annoying bug where if you execute it while on air, Samus falls like a brick and dies before the final smash is even out. Happens to me more times than not.