Difficult one, sometimes the drift off subject is a pain yet at other times it produces wonderful information that is more useful than the original discussion.
Second point, I tend to reply directly to a specific request or to an obvious diversion. Otherwise I tend to add it to the end.
Not sure if this is a good idea but it certainly sometimes goes wrong when it doesn't come out where it is intended and becomes totally confusing. I presume it goes wrong when someone else gets in first.
It's certainly easier to reply directly to something that is on the screen as you write than commenting on something at the end when the original is not visible.
Flux
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