With the last versions of Celestia, new features appear in objet contextual menus like those of planets. Indeed, among them, one particulary is the vector reference submenu where you can decide freely to show (for each independant objet ) or not graphical elements like frames, sun direction, terminator planet grid... It is easy now to show them only checking options in this menu.
This Submenu is a checking list where is common to check or not several element of them ; for instance, showing sun direction may force you to show terminator. It you want to do so (and this for all objects for which you've decided to show these additionnal graphical features), you have to check each option restarting the contextal menu showing procedure each time ! How boring it could be for a lot of objets!
A simple (and useful probably
) solution would be to set this menu semi-persisting : when you've shown the contextual menu with your mouse click, you press SHIFT button for instance, and then this stops menu disapearing each time you click any option. In this case you click all your options in one time : how easy it would be then! 
This feature would call then transparency for contextual menu background to show the most clearly the results of the clicked option!
It would be also an interesting feature for all future checking list that could be added in this contextual menu (Specific object add-ons list???). Anyway, what's your opinion?
Thanks to advance!