Expose options to explain? (track_io_timing)

Salut!

Fellow volunteers, I request assistance in understanding the following:

When I explain a query I can get the following information:

| "I/O Read Time": 0.000,
| "I/O Write Time": 0.000

I know why it is 0. My question is this, can we expose it to explain
only? Specifically "explain (analyze,buffers)". Is there a technical
reason we must turn on track_io_timing for the whole system? If there
isn't, is this something the community would want?

JD
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