Well these clones could attack. Considered that?
Multiple Bushin Punch? All your clones punch at once.
My way of creating them would be that you devided your chakra so that you only have a set amount of clones that you can make. And I think it would be nice for the sitter to get something unique, only for them.
Off-topic I know but I want to add that. It's pointless if the clones can attack, you know why?
Half chakra = half power = 50% effective or less. Very rarely do we see any foes in Naruto succumb to Multiple Shadow Clone jutsu. For all we know, the only reason Mizuki got hit with it was that he got caught by surprise. No one expects a Genin to perform that jutsu, after all.
I cant think of any (significant) foes that succumb to it off the top of my head. We just saw Nagato knock out that jutsu with 1 move a few eps ago. >.>
Even if it's implemented, it would definitely get nerf somehow especially the "hit accuracy" dept. Probably seeing so many misses on the opponent.
Also it doesnt matter if it has the same hp as the user since one hit is enough to "kill" them...even 1 pt of dmg is enough. >.>
EDIT: Now that I think about it, Chidori should be a Sharingan/Lotus combo move. After all, you need Sharingan to use it successfully. >.>