Option-Click Font Size buttons for single increment
 

Often the default font size increments (0.2) are too large a jump for me, and it's a little cumbersome to open the Site Prefs panel ever time I get picky about the font size! :)

Ideally I'd like to be able to hold down Option when clicking either of the sizing buttons to more finely control the size, so that if hitting up twice (1.4) is too much, then I can Opt-click down to get to 1.3.

Small, but an added convenience. :)