Thanks to ROM tools written by Shadowmite and a leaked GSM Treo 650 firmware update package to work on, I was able to make a custom ROM for my beloved Treo 650. After getting rid of unnecessary ROM modules and adding many programs to the ROM, now I have 11MB of free RAM available for my Treo. Nice!

P.S. I have posted instructions about making custom ROM for the Treo 650 to the local Hi-PDA.com forum and have since seen several cases in which inexperienced Treo owners failed to follow the exact steps in flashing their devices, resulting in completely useless Treos. This is not what I had intended but I did warn them. Oh well.