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There is an option for the default amount of space between the rightmost grace note and the main note it precedes on the Notes page of Engraving Options.
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Probably not to move them to another column, no, but it will ultimately be possible to move their graphical X offset. (I forget whether that is actually possible already: it may be.)
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I will make a note of this.
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No, it’s not possible yet, but this is already on our backlog, together with other related issues, e.g. the minimum length of a glissando line after a system break.
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I don’t think you’re quite right about this. I find that grace notes track the pointer quite well when I drag them.