Some more ideas:

Graph of accepted and rejected share rate over time (not just hash rate).

Ability to completely disable certain feature sets.  I'm not sure I want a webpage to be able to edit files that could change where my miner pays out to.  If the local client had a configuration file that let you select the items you wanted to turn on or off, that might make the more security conscious feel a lot more at ease.

2fa/u2f to access.