Just a minor update: this feature (two languages in one document) is a must for major international projects where every single document from simple letter to as-built drawings and geodetic surveys must be in national language + English.

Such oil&gas companies as Exxon, Chevron, Technip and many others use this bilingual slashed format even though it may look a bit primitive.

* So far I translate the entire text as I normally do (to have the translation in my TM) first; then I  change all segments status from Translated to Draft; then disable the TM Upgrade feature; then manually copy the target; then press Copy Source To Target; then add space and slash at the end; then press ctrl+v to insert the target just copied at the very beginning of this process. As a result, I have Source / Target segments where I need.

It would be also great to select particular segments I want to slash, because sometimes (like with numbers, dates, different parts of same paragraph, serial numbers, etc.) I do not need to slash.