I just heard a cinematographer suggest that when shooting at 24fps, shoot with the glidecam at 30fps @ 1/60 and then conforming the footage to 24fps to give the footage a more cinematic feel.
Any thoughts?

I've not heard of doing that. I shoot at the project frame rate unless there is a need for overcranking.

If there is no dialog, you can shoot at 30 and playback at 24 for a slight slowdown. It makes things "float".

But don't resample 30p at 24p. That will look really bad.

Regarding the shutter, yeah 1/60 @ 30 fps is the classic 180 degree shutter. For sports, you can shoot 30p with a fast shutter (< 1/120) and play it back slower at 24 fps for a bigger than life, urgent feel.

I've not heard of doing that. I shoot at the project frame rate unless there is a need for overcranking.

Shooting at 30 and conforming to 24 will just slow it down a little bit. May make your Glidecam a little bit smoother. Just test it out yourself to see which one you like.

Yea, that was the comment about overcranking.

I wouldn't shoot 30p for a 24p project and then not use the footage as overcrank. Converting 30p for real time in a 24p project can look really bad. Worse than slowing 24p down 15%.

How do you slow that down in post? I run on FCPX and am not really sure how to do that? Do you do it after the clip is in your timeline?

You can start a project in 24p (or 23.98p) and insert your 30p/i clip and it will conform. Or if you have the project conform to the first clip you use (in 30), you can still go back and change the project settings to 24p.