Because this method of showing relationships has its own dedicated web site which has been becoming more and more restricted to paying customers, I wonder if there might be problems getting the rights. Separate from that concern, I think that this request is too narrowly focused.
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1. Parallel translations/text
2. Ability to separate propositions independently for each translation/text
3. Easy placement of arcs
4. Pre-labeled logical relationships
Item 1 is currently available.
Item 2 is currently available.
3. Arcs are available but like many symbols the ease of use could be greatly improved. My personal #1 addition would be a background grid to make alignment easy when extending the arc to the left.
4. Is an excellent idea that should also be expanded to include labels for tree diagrams - at least the labels used within Logos for the drawing of alternative structures; preferably also with either some common syntax theories or with the ability of the user to build their own palette of labels.
