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Has anyone used LGS to fix a rough or uneven surface on a delicate miniature? Can you brush it in, let it settle in the recessed, remove the excess and let it dry?

Yes, it's quite a good surfacing paste. Apply thickly, let dry, scrub off with an old brush. Repeat (many times).

It does shrink quite a lot, so it takes many applications to get a good result with it, but as it's dyed, you can see imperfections in the surface quite easily.

As a gap filler though, milliput is still king in my opinion. For terrain, I've also taken to using pre-mixed wood filler which works pretty well.

IMO, liquid green stuff is bad. I don't think that's a particularly controversial option, either...

For smoothing and gap filling you are much better off with Milliput. Milliput can be mixed with water to create any consistency you like; from clay-like, liquid green stuff-like, to flat out watery. It doesn't shrink when it dries, and it sands brilliantly.

One thing I use as a polystyrene model filler is something odd:
Melt plastic sprue and bits into the Tamiya green cap glue (when you are down to the last dregs of it).
It makes a fairly easy to smooth-on material depending on how much plastic you dissolve in.
Of course, it welds in really nice.
Milliput is a standard out there and you cannot go very wrong with that.
Are you primarily trying to fill or also bond as well?

This is primarily smoothed and blended with liquid GS.

For a surfacer, it's very controllable (milliput is better for part blending, especially when wet-brushed, but is messier to work and can be tougher to clean up from brushes as it dries).