I would like to see a new feature in Lectora where you can compare two or more titles and the option to combine them. This would be a feature similar to what you would find in Microsoft Word’s Review Ribbon.
While its not a true “Compare” option, you can “Import from other title” on the tools ribbon. This brings up a title explorer view of the other title, which you can then pick and choose which (or all) objects you want to bring into your title.
Lectora is also able to run multiple instances of itself, so you can open the two titles side by side in two copies of Lectora and just copy and paste between the titles at any level. You could copy an entire chapter or test with a single copy/paste operation. Lectora works out all of the title level variables and such for you under the covers, making this easy.