For the visually-impaired (or those who just like larger timeline frames or, like me, seem to suffer from permanent eyestrain from too' much time at the computer), you can enlarge the frames on the Flash timeline. (Or shrink them, although why you'd want to press your nose up against the screen like that is beyond me. Grease-marks are hard to remove from an LCD panel.)
To change the size, click on the timeline's menu (three small lines + downward pointing arrow in the upper right corner, as usual). You'll see a wide range of options, all as relevant to size as late-night pill commercials. The default is "Normal;" click on a new option to enlarge or shrink the frame size.