Sweep attack suggestions/fixes/ideas/optimizations

So, l really love the concept of the sweep attack being added, but someone made a good point in a youtube comments section.

What happens when you accidentally hit/kill all the animals in your pens?

That is a very good question, so here are my optimizations/ideas for the sweeping attack.

Idea #1: Sneak Only!

The basis of this idea is that sweep attacks are performed ONLY when sneaking, despite if standing still. While this can be a hinderence to some, the general idea is that it prevents a lot of accidental rage.

Idea #2: Combat Modifier Key!

The basis of this idea is that there is a combat modifier key. When using a sword, holding this then attacking will perform a sweep attack, similar to holding ctrl or shift to do other things. This also opens up opportunities for lots of different weapons, you could have certain things with axes and bows too!

In addition to vanilla, another key opens up lots of opportunities for bukkit/spigot plugin development for multiplayer, which I believe makes up a pretty big percentage of (Popular/successful/not one to two little kids starting a vanilla server because they don't know about/how to make a spigot/bukkit server or modded server) servers, minus MinecraftRealms. To add custom abilities/moves/MILLIONS of other things, you are confined to the controls that are built into minecraft vanilla, unless players install things. It also aids minecraftforge/other mod development, opening opportunities, making things consistent, etc.

Tell me in the comments which idea you prefer!