I usually put a line over т and a line under ш when I write. It's easier to read it that way. Many people do that, too. That way the word пиши would look more like a word than a bunch of wavy lines. =)

But I wouldn't put letters apart if I were you. Try doing that in a russian school, and you're gonna get killed by your teacher. I never saw anyone do it. Not like in english. =)