I just thought it would be kinda cool to have a translation interlinear. I would think this would be possible with all the translations that are interlinear and since sympathetic highlighting works.
My vision is to have a "translation interlinear" under the Text Comparison option in the tools menu. You would pick a base translation and then have a drop down list of the available interlinear translations, much like the current "display" option in the 4.0c beta interlinears. This would put that translation directly under the base text in a different color (so you could easily follow your base text and find the way the other translation translates it).
It sounds easy to me, but then again, I don't have to program it :-)
Its on uservoice....
Translation Interlinear (http://uservoice.com/a/bBiZp)