I know of no crash stop protocol that gets you back to the casualty without some sail trim sometime, depending on wind and boat. The closest might be with a sloop with a smallish jib close hauled. Then one might tack at once, not touch the jib and let that help haul you around to gybe, come up a little and tack gently into a heave-to (backed jib) to pick the causualty up on the lee side. However, most modern boats have such large jibs that this will not work.
Anyone sailing with crew that really cannot perform a rescue should make plans similar to single-handing - that the boat will be stopped within swimming distance - and hope that whatever caused one to go overboard has left one conscious.
Or perhaps jacklines and tethers as a matter or routine. Why fall off when you can stay aboard?
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