Heh, with all these options, I might have to make a separate settings page just for keybindings! In v12, there will be an option to switch [,]&[.] with [<]&[>]. So pause/step will be [>]. In a future version (v13 or v14) I'll change that page's layout and give more toggles and settings for oft-changed keybindings: secondary menu navigation, z-level navigation, and anything else you guys suggest. v12 is mostly ready, I'd just like to wait for some graphics packs to update (or verification that they don't need to be updated from 0.34.08 to 0.34.09).
BTW, space is also used for pausing if you don't like using the [.] or [>] keys. =)