OK, I spent a lot of hours this afternoon updating all the enhancements to the new source for 1.0.2
I tested it for a while (and it works well with my mega), but if you find something, just report it here:
1.0.2 Update (2012-11-06)
http://arduino.cc/forum/index.php/topic,118440.0.html
-Fully updated to official 1.0.2 version (but keeping all things, new JDK, new WinAVR/avrdude, pretty icon, Bluetooth responsiveness, etc)
-Some workarounds for Leonardo board in the AvrDude Wrapper. (somebody with a Leonardo please test this!)
-Setting to revert the function of Upload button to Upload and open Monitor (install the IDE, then open idesettings_v1.0.2.txt file):
serial.open_monitor=true
-Other small fixes