On short posts, the last edit message looks pretty ugly:
So how about either change it to either of these:
Or some sort of pencil icon next to the quote button that shows the last edited when hovering over it.
Other idea is changing the post edit limit to one hour instead of 30 minutes. 30 minutes is often just a bit too restricted, especially when dealing with forum games. An hour on the other hand keeps the limit in place but doesn't overkill it.
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