Depending on how your district does things, you may be working in multiple stores. The SFT at my store also works in a few other stores and he gets his hours from the district rather than from the stores.
Also, communication is key. You would have to keep up with TLs, ETLs, STLs, your DFM, plano team, and signing TMs.
Great job to have ...several years ago. Now, less so. As others have pointed out, the amount of paperwork seems to be getting out of control (as of a couple months ago when I quit, anyway). My SFT was constantly complaining about how much planning/scheduling/followup he was being asked to do--to the level of having a detailed daily calendar for every task he had to do, which he then had to copy onto a paper daily checklist to carry around at all times, which he then had to copy back into the calendar at the end of each shift in order to "keep track of things"--as if he was unable to keep track of things any other way. DFM walks became less about seeing if the bathrooms were in good working order and more about seeing if the SFT had kept an accurate log of how many minutes he spent on the phone with the plumber each day, etc. All in line with the shift the rest of the company seems to be making toward a "form over function" philosophy, business sense be damned.
(That being said--if it's a pay raise, go for it. Even knowing the direction things were going, I would have applied for the position if it was in my best financial interests; it just never really was.)