They'd be able to "brace" them in the ground then, and you'd take damage by trying to walk through someone's pike they were holding. I think it would be awesome.
I understand what you are trying to say, but it should be a secondary mode that has a separate animation.
Otherwise, Support poles would only be effective in organized lines or by themselves. Which would make battle servers even more "Hero" orientated.
Keep the way they are now alone and just add a secondary.
I believe Napoleonic Wars has a mechanic like this, if you stand still with a pole for a couple seconds. (Including rotation) You will brace the pole arm in front of you.
Not against the idea of that, but I would rather it was implemented differently than you say.