How can I eliminate or do an auto login for QNX 6.3 during boot?

You can do it in the /etc/rc.d/rc.local

If you are using text console, you can easily login a shell in the rc.local so shell session on the console without a login.

If you are using photon gui, it is a bit more complicated, as discussed in
openqnx.com/index.php?name=P … pic&t=3219