Thanks for the tips. We did get the DTX control panel, and it works quite well. XAMPP 1.6.2 for Windows version did not include a MY.INI (at least none that I could find), but it did include a MY.CNF so I was able to change it there. I actually like the fact that DTX provides one .ini file that configs several apps. I also like the control panel. We're using this for educational purposes, so the XAMPP control really provided more options than we needed (installing as services in particular). DTX just has buttons that start and stop HTTPD and MySQL, which is all we need the students to be able to do... perfect!
Thanks again for the help!