Thanks. Actually just about ANY 2-stroke shape will make a 5, even it's only vaguely 5-like. For instance, you can draw a rough "S" (sloppy 5) and then add a dot at the end. Or draw a dot and then the 5. (Or some random 2-stroke scribble: occasionally it will make a 4 but usually a 5, I find. Although you can make a 2-stroke 8 and it does know it's an 8.)
Also, it doesn't hurt if the strokes overlap. It doesn't have to LOOK like 2 strokes, it just has to BE 2 strokes. So you could draw a perfectly normal 5--just lift your finger and put it right back down, anywhere you like along the way.
Weird but it works, and I like that input method.