Before I say anything, I haven't used the CS in 3 years I think, if I ask anything stupid please understand. (:

I'm planning on making a big continent that isn't connected to Cyrodill (like the Shivering Isles), if I'm not mistaken, I've heard that to render distant trees, land, any other props; you have to use a LOD generating tool. But I'm (at least planning) to release this mod over TES Nexus, is there anything I can do to have appropriate LOD included in the files that I'll release, so the user doesn't have to use a LOD Generation tool?

Why yes, once you have generated the LOD files they will be stored in Data\DistantLOD and Data\textures\LandscapeLOD -folders, which from you can snatch the files and include them in the release-ready package. Also, non-landscape meshes have a _fat.nif if you intend to have them visible when distant (VWD). This kind of _far files include, as an example, the cities in the game (you see them even from the edge of the playground).