For instance, since I main summoner I use the Pet menu, however it's missing crucial things I'd like to have easy access to such as Nearby Characters and Place Party Beacon.

I would love to take off Select Camera/Light, Run Chat Macros and Perform Emotes(since I memorize all my chat macros and my emotes are all bound to alt+buttons for the ones I use) in order to add Nearby Characters, Place Party Beacon as well as the button that lets you change what you see over people's heads (name/alliance/hp/ETC)... Unless I'm missing something totally obvious here I don't see a way to change them as of current.