I need to transcript to text some recordings and I need to jump back and forth, but sometimes 2-3 secs, sometimes 10, or more, or less. (On the long run these differences are not trivial in this type of work.)

I would like to be able to edit these settings, for example, to create a shortkey for a custom length of 1, 2 or 3 secs.

Is there a player with such settings?

EDIT:

I guess it would be difficult to find one that allows a large scope of editing, so I will restrict the scope of the question: a player that would allow editable shortkeys for 1-second jump back/ahead.