Technically, this would be possible by overriding the function qa_db_calc_passcheck (from qa-db-users.php) and simply returning the password instead of hashing it. See here for how to do function overrides.
However, I would strongly recommend against doing that, as it is grossly insecure to have passwords stored in plaintext in the database.
YM2C:
Source: http://www.affiliateprograms.com/blog/wp-content/uploads/2014/04/how-to-create-secure-passwords-infographic-full-2.jpg
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.