I have encountered the situation before and I know exactly what you mean. I often too find myself using the “Back” button to see what the value or entry was, before I go further.
However, the Manager is built on simple yet modular pattern. Adding ability to view the cross-module multi-screen information (like that done from an AJAX enabled web app e.g. Google Maps) would not only make information retrieval tricky but may also serve the antithesis of the Manager design.
Of course, this is my personal opinion but do understand that the desktop version of Manager is itself a web application underneath its GUI widgets. If you have a server edition, you can open multiple windows and do whatever you want, in the browser!
For instance, when composing an email in Gmail, if I have to find a reference, I don’t go back - I just open a new browser window. That’s exactly you can do with the server edition of Manager.