Hi Cass,
Can't help you with your SMF questions as I don't (yet?) use that feature, but to view the currently selected 1-4 STS "realtime keyboard tracks" on the screen, simply press the "Style Play" button. (see page 26 of owners manual).
Being a complete Korg arranger newbie myself, I too have found the Korg OS a little challenging to initially get my grips on, especially because so many features are so deeply buried in sub menu pages and or not very well explained (if at all) in the owners manual. That said, here a couple things I only recently figured out:
1)You can view the "bank-location" of your currently selected Style, Performance, or Program, but pressing the "Shift" button and then the "left most" button of the aforementioned button Style, Performance/Program sections.
2) You can trigger a fill with playing velocity (how hard you play a LH chord)
3) You can assign how Fill-1 and Fill-2 buttons function
a. up to the next variation
b. down to previous variation
c. fill to self (off)
4) On KB startup, the setting of Performance Bank 01-1 are automatically called up, so storing your prefered KB settings here is probably a good idea.
Tips and tricks shared by others greatly appreciated as well.
Scott