I have done this:
"virtualenv is now supported (to configure, go to Settings | Python Interpreter, click Add, and select the python script inside the Scripts subdirectory of your virtualenv directory);
refers to the file ~/.virtualenv/project/bin/python
You can add the interpreter in global settings, but leave the main interpreter selected, and then go into Run | Edit Configurations to specify the specific interpreter for your project."
yet I still cannot run manage.py tasks under tools as it is disabled. Does anybody know why?