How to remove soft navigation keys in Xperia without affecting Dialer's call button? I am using Micromax A310 running a custom rom (Sony Xperia).

Whenever I try to remove the soft navigation keys by editing build.prop, the soft nav keys are removed successfully, but my dialler's call key also disappears. The only option remain is to switch to some third party dialler, which I don't prefer. 

Please provide some pointers on how to remove the soft nav keys without affecting the stock dialler's call button.
Try hiding the soft keys using Gravity Box, a module for the Xposed framework. Gravity box will let you tweak parts of Android without the need for a custom ROM. There are 3 different versions of Gravity Box for 3 different versions of Android (JB, KK and LP). Link for framework: Xposed. Link to modules: Modules. You can then search for the module you want.