If it's not a big hand and I dont really care, I just say check. But when it's a big one, and I don't want to give off any sort of tell, I tap the table with my hand. I play like that most of the time, but sometimes do the exact opposite.
I love the finger twirl the most. Though You want to mix it up . Sometimes I would glance at my watch and if its past 30 seconds on the second hand I will pick the soft tap on table etc etc ..When playing for a bigger stakes I would only use the glancing at watch only with shades on or prescription glasses that have tint.