If you would like to reverse a transaction with a different posting date then you can use the Posted General Journals Page and the Copy Selected Lines to Journal or Copy G/L Register to Journal function:

This copies posted journal lines to a Journal and when the lines are copied you can selected to replace the posting date

It's not as quick as using the Reverse Transaction function but it does achieve what you're looking for with a few more mouse clicks. If your Posted General Journals Page is empty ensure the function is first turned on in the General Journal Templates Page:
