It would be nice to have a GTV view window (similar to the floating window that pops up for linetype, text, hatching etc.) for each GTV allowing you to scroll down each GTV to see what's what as the undo does not undo a GTV that has been entered/updated by mistake so being able to see an image of each GTV will help reduce making this sort of error.
That sounds great, but I think it would take a lot of "horsepower". If you use the MultiWindows, they take a while to regenerate when you open the file, or close them and open them again.
...I'm running a v8 supercharger...16gB ram custom built lenovo S20 dual core xeon....but I see your point. Given the floating windows are relatively small maybe DataCAD could be configured to display entities of a minimum length to omit the small stuff so the image displays quicker?