1) The way the files are set up for 3.0 is different than pre3.0
2) What ever you do, do not take the files from pre3.0 versions and compile it with the 3.0 sma. Bad things will happen
3) Look in the war3ft.cfg file found in addons/amxmodx/configs/war3ft/
4) no extra xps are given for grenade kills, the only thin u can do ( pre V3 - only got the latest V2 installed, never touches V3 ) is to enable the option to give more xps on weaker weapns ( grenades included )