I would like to do back slides during a presentation in keynote without having to go through edit mode
If you are working on an iPad as your profile suggests you should ask this in the Keynote iOS discussion.
Have you tried hitting the '-' (minus sign)?
You can also use '+' (plus sign) to go forward.
The following may be useful: http://help.apple.com/keynote/mac/6.0/#/tan951def1c9
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