You can set the default part template by first creating a part, setting it up exactly as you want all new parts to be and then click the 
in the File Menu. Then, every time you create a new part, it will start off as a mirror image of the default project you saved.
The file is named Default.part and is in the library '___SystemDoNotRemove' directory .
You can always reset the default part to the factory default using the File Settings.