According to your proposal.
It looks like Ctr+Z operation (cancel last action)
Right now you can operate with following variants:
1. Backup operation before vital changes - see section - Tools - Database backup\Restore - http://screencast.com/t/ZmlBPDUl0y4K
2.You should use Bridge connection with GET-POST mode
In this case you can work off-line and POST changes to Store.
You can edit Pending data before POST - http://screencast.com/t/ZVpu959APm
You should be familiar with SQL for this variant.
If those variants don't suits you. please vote for this feature.
According to our Policy, we implement a new features according to the volume of customer votes.
Right now we have 0 votes for this feature :-(