All kinds of block variants for Botania materials that don't require new textures (buttons, pressure plates, fences, fence gates, walls) will be added in the 1.21.1 port. As for signs and (trap)doors, or even boats, those need new textures, and thus depend a bit on how much time our texture artist can find to work on these things. We are also missing other decorative vanilla equivalents, such as smooth quartz variants. There will likely not be shimmerwood signs, doors, or boats, as their rainbow animation would likely desync from the plain shimmerwood texture.