I dont have a gemrb.cfg in /home/user/.gemrb, in fact there is no folder called .gemrb there for me. Am I supposed to make one and put the sample gemrb into it and edit it?

The game starts up fine. I copied my install folder of BG2 to my phone and then put in a sample gemrb.cfg. I changed the paths of GUIScripts path and GEMRB path to /usr/share/gemrb/ and it loaded up.