There not making it toggle-able.
It's going to replace your very basic attack and act as a traditional auto-attack.
That's the words of the dev post from earlier in this thread.

I think they're just doing this because there is no way with the current system to land a successful "Shield bash"
Even with every idea I had, not one would really solve this problem.

They're basically just going to take out each classes basic attack. Maybe either convert the secondary to a TP required skill or you can use it to build TP for strategic purposes in conjunction with the auto-attack.

Anyway, they're probably going to increase the rate at which we build TP, so rather then pressing all those buttons to build TP we're probably just going to be using half as many actions though all using TP.

Anyway, they can make this work. Though I'm personally not playing a game I have to wait anywhere near 5 seconds to attack.
Figure out a way to make it closer to 2 seconds and i'll give it a shot. (or at least make PUG a spam fest of TP skills)

I don't know what to hope for this, but the game basically just going to change from building TP and controlling every action, to just using your strategic TP actions. The dev assured us they're not going to slow down battle too much. Cause I"ll tell you one thing, I never played any "just" melee classes in FFXI because they were all so incredibly boring.

Wait 5 hits and strike (if you can get your TP gain high enough) were very unattractive classes to level.

This game has much more use to it's weaponskills for melee classes.
I see that right now there's too much focus on the building of TP and not enough on the strategic benefits to each tp required action.

So yeah I think I must admit this is probably the best solution.

I want an FF Action RPG MMO can you make one please!
Or a Star Ocean MMO would be really popular and successful I'd imagine.