Enigma2 is not designed for security in mind. Opening up ports on your router without SSH keys has to possible consequences:
1. People can stream from your box
2. People can use your box to launch other scripts on your home network
(One of the developers allowed someone else to work remotely on his box owing to different reception standards between countries, somebody else hacked in and wiped the HDD on the receiver).
Make sure you do it correctly if you decide you want to do this.
