It’s a VERY nice tool!!! Get it, get it now. It reminds me of a very old tool called Deep Paint. You import the model, and then directly “paint” onto the object. The program is responsible for the tiling and proper alignment of those textures onto the UVW map. As far as getting a tileable material that tiles acrosses multiple objects… well, that’s a whole different monster. Proper planning and all of that.
To “un-seam” everything, you can just use a UV Mapping Clear modifier on it with the proper channel. That will clear the map. Then apply an unwrap on it, and then normalize -> pad.
edit: you can also directly texture using photoshop, but it’s a fickle beast to say the least. Completely uncooperative.