For content which is alienated, provide a way for users to get a wikitext editing window for just the wikitext for that item. This allows users to modify content that does not have an inspector yet, and for "power users", make tweaks in an environment that is familiar to them, without overwhelming other users. Ideally, this would be syntax-highlighted and pretty and helpful, but anything at all would be a start. :-)
This will require some serious magic in Parsoid to identify the causal wikitext and allow partial document retrieval, and so this is very much in the "enhancement" pile for now; putting in UI as it's an inspector, but it will have impacts all the way down through DM.