Can we increase size of launch pad dots

We're teaching seniors how to use Mac OS X. We've already increased the size of the cusor (either Accessibility or Universal Access depending on whether you have Lion or Mountain Lion) so now the seniors aren't having too much of a problem finding their mouse pointer.

However, when we go to Launch Pad, where we have two screens of applications, many of them can't reach the second screen. Normally, the tip of the mouse pointer arrow is the "active" part of the pointer but not when you've increased the size of the pointer. The dots on the Launch Pad screen are so small, many of our seniors haven't been able to find the correct location to have the arrow on the dot in order to display the second screen, or to get back to the first screen if they're lucky enough to get to the second screen.

We're now resorting to having them use the keyboard shortcuts because using the mouse just isn't time effective and it's frustrating to the seniors. Is there an option that we haven't been able to find which would allow us to increase the size of those dots so it would be easier for our seniors to click on them?

Now, I know someone is going to respond about using the two finger swipe on either the Magic Mouse or the Magic Trackpad. We're a SeniorNet Computer Learning Center so we teach both Windows and Apple classes. We're using Mac minis and Windows style mice and keyboards. We can't afford to buy either the Magic Mouse of the Magic Trackpad for our Apple systems.

Tom Adams (SeniorNet volunteer)