The Property Editor is great and almost work as an inline editor, but as I work with visual content line names and text I keep looking at the diagram as I type, not at the Property Editor so adding a full inline editor is on my list of ToDo. Inline editing is straight forward as we only activate an edit box in the diagram, but it is a bit of work as this needs to be specialized per visual symbol. The graphics engine have a design layer to support inline editing – the select markes you see (yellow dots) use that layer. This allows me to add other inline editor tools as well later.