Hello,
By distance textures I assume you are referring to foliage distance textures? I'm not sure that I've ever seen a distance texture limit in FS22. One thing you could do if you wanted to reuse some textures is to save the common ones to a shared path and reference the same path from multiple foliage xml files.
Some limits, however, are just hard limits beyond the scope of anything a mod could do. For example, infoLayers have a hard set limit of 255 colors because the bitmaps they use for painting the information only support 255 different color values