I'd like to remark the lame ones.
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* ability to see your server
...
* an option to mute the main theme
Use SwiftSwitch.
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* skill outfits to wear while training a skill
There's an "outfit" for nearly every skill, what else do you need?

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* able to change your race (elf, human, dwarf, gnome, ogre, etc)
That's one of the points that RuneScape is GOOD at. That you're not sticked to a race. Unlike in some other (boring) MMORPGs.
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* auras to boost combat around your teammates (perhaps from prayer)
Don't these new lunar spells do the same thing?
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* have userset censor levels (submitted by Monkpunk_24)
...So you could get banned from the game more easily? Or return the completely useless "PWN" word to the game?
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* Jagex Shop can sell untradeable special outfits
I think paying for members is enough.
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* option to name your cat
I think there already is such an ability, I just don't remember from where it's accesible.
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* replace the black void in the background with colors that match the environment
With the creepy 3D character images Jagex makes for promotion?
The others are pretty good. Especially the 'BRB'/'AFK' stuff. But I don't think you'll need it since you're logging out after a minute of being inactive.