Instead of adding 1.7 support, I would rather see the OG-SG server cease support for all versions above 1.12.2. In the server hosting community it is commonly known that versions above 1.12.2 are very unstable when it comes to hosting multiplayer servers, especially servers with modded jars like...
The project lead of OG-SG will probably never open up the server to cracked accounts since it'll greatly increase the incoming traffic of hacked client users. Case closed.