You're rightHey Jach...FYI, you don't have to include the full content in the ini's. You can just include the TYRES_FX_CUSTOMTEXTURE parts and they will be combined with the car ini's that come in the shaders pack.
Also, since I'm assuming you are in the discord, check out the updates channel on the post for lights-patch-v0.1.23-preview5.zip. There was a texture set released with that one that has all textures for the acfl, and others that are set in the ini's that come with the shaders extension. The texture set is a mod so installs the same way as the main patch. It doesn't need any ini's since they are in the main shaders install already. You should talk to x4fab about combining your RSS textures with these and uncommenting/updating them in the main ini's. Then you could just distribute the texture set on here in the MODS form. That would make the install instructions much less complicated probably. What do you think?
For RSS I changed the texture ('cuz I packed the textures in a zip for simplization so I can't use the already installed ones, which use the textures unpacked in folders). However for the acfl and F138 that I released, all ini I used are by the Shaders Patch author rather than me