With effective stacks down to 10BB, there is still room for a mini-raise or slightly larger, which is often enough to take the blinds down. With 15BB or less you can also open jam. Jonathan Little did some videos recently on short stacked tournament strategy on Youtube.
Apparently the GTO strategy with these stack sizes is to split your range into limping / jamming or mini-raising / jamming depending on your position. Its kind of complicated, and if you want to play everything as either a jam or a mini-raise, its probably not to much of an issue, as long as you are playing micro stakes SnGs.
For me I also like to take a somewhat exploitative approach. For instance I might limp in from SB with those 15BB or so stacks, and if this induce an insta jam, my second or third limp will be a strong hand looking to call off the jam. And if not I will continue limping a wide range rather than giving BB a walk, when there are antes to fight for.