There was a plugin that allows edit tags on view mode, I think it is xp-aggregation plugin by Keaton Lao TiddlyWiki XP by Keaton Lao
Demo: TiddlyWiki xp — A chance to experience TiddlyWiki very quickly
But it does so by modifying $:/core/ui/ViewTemplate/tags , I think there should be a better solution, despite it is very useful.
And I think this could be release as a standalone plugin, because I’m using Hyper-Table plugin, not using aggregation plugin’s dynamic table anymore.