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Read.
When you use the mod, you can't use any main game characters and vice versa. You have to make a new character and essentially are "cut off" from the regular game, so there is 0 interference between seamless co-op and vanilla.
...and to answer your question more completely, it is perfectly legal to use.
Not really true. I played once with my coworker, we both used level 200+ characters. it was the first time for both of us.
Edit: FAQ on nexus:
Q) Can I use my save game from the base game?
A) You can, although it would require more work. As mentioned the mod uses separate save files by using the ".co2" file extension instead of ".sl2." Make a copy of your .sl2 file, then change the new copy to .co2. Once ingame, you will receive the mod items automatically. Do not move your save from the mod to the base game, as that may get you banned.