Would you ever consider replacing the default navbar in your theme? The vBulletin one isn't that great looking or overly user friendly.
Something with oval buttons and nice drop downs when you hover over them might look nicer rather than just a bar.
If that would be too difficult perhaps just add an extra navigation sort of like on this theme at the top right:
https://vborg.vbsupport.ru/showthread.php?t=255186
I could do it myself but I found it hard making it look exactly like the rest of the theme (shadows/border).
My favourite way of doing it would be to take the area where your current navbar is and replace it with a navigation similar to that in the above theme (very top right).