I did scan the discussion - just thought I'd toss in a different idea.

But I did miss the "already selected" part. This can be an annoyance with
selection events. A benefit of my suggestion is that you can click  on a
different cell in the same row - you're not limited to Column A.

As far as I know there is no way to get a selection change  event, or any
other event, by clicking  on the already-selected cell. However, you do get
a "before double click" event if you double click a cell. Perhaps that's an
alternative.

The converse problem is that you sometimes get too many selection change
events. Every time you move the focus, you're going to get one, and you
need to handle it.

In general, I like to avoid selection change events, because they can be a
pain. But sometimes, they're either necessary, or simply the best approach.