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In my experience, manually editing a gmapping generated map is not a good idea. AMCL based localization suffers and you will get unforeseen issues.

Usually one wants the map to look pretty, but this is not usually the case. Sensor noise, reflections and other perturbations will make the map look ugly. Anyway a machine generated map does not need to be aesthetically pleasant, since the target audience of the map are robots. Manually beautifying the map might remove vital information from it.

If you want a pretty map for visualization purposes, I would recommend to make a copy of the original map, make any beautification in the copy and publish it on a different topic.

In real scenarios it is not rare to see a /map topic with the raw map for the robot to use and a /map_for_gui with the beautified copy of the map for human visualization.

I hope this helps