@FatherWh0 I've no experience with spigot/paper but happy to accept pull requests on the GitHub repo. Of course if you have the dat files from the server you can use the vanilla version with the "local dat files" option described in the documentation.
I really like this mod, i use the forge version but i am having trouble getting it to work loading the dat files for my server. Is the correct folder path config/BBOutlineReloaded/ip/port ? I have my dat files in the port folder but it doesn't work. Using cache works fine but I'd prefer using the dat files themselves.
Also when I put the mod on my personal server, it doesn't crash me or the server but I can't join and I get this error in the server console.
[Server thread/ERROR] [FML]: Exception caught during firing event net.minecraftforge.fml.common.gameevent.PlayerEvent$PlayerLoggedInEvent@46a656d9:
at com.irtimaled.bbor.forge.ForgeCommonProxy.sendToPlayer(ForgeCommonProxy.java:112) ~[ForgeCommonProxy.class:?]
at com.irtimaled.bbor.forge.ForgeCommonProxy.playerLoggedInEvent(ForgeCommonProxy.java:80) ~[ForgeCommonProxy.class:?]
Really good mod though, love using it for farms in vanilla.
If you want this for building aid, then there are already separate mods for that type of stuff. Although I think many of them use mod blocks for that purpose, so if you need this in "vanilla" (quotes because it obviously isn't pure vanilla if you would be using this mod anyway, but maybe no mod added blocks/items at least) then in my opinion it would make more sense to have that as a separate mod rather than disabling all the usual functionality from this mod and then adding a separate mode for it.