I tried 1_4, i haven't found any known issues while using the normal positions, as well as similar ones, everything seems to working as intended, and i believe the auto knee-bending was a fine addition to the mod. The knee bending only breaks when using non-oral positions (as mentioned), so a solution i would recommend would be if you added a toggle for auto knee-bending, since you would have to go into the settings file to disable auto knee-bending, then restart the game whenever you would want to use a non-oral position. Otherwise, nice work on the mod.
AnySizeHer is installed like most other mods.
1. Download and unzip the mod.
2. Move the mod file into the "Mods/$INIT$" folder. The mod file is a flash file with the name "AnySizeHer_v1_4_1". The "Mods" folder can be found next to your "SDT" and "Loader" flash files.
3. Move the settings file into the "Settings" folder. The settings file is a text file with the same name as the mod file and can be found in the same folder. The "Settings" folder can be found next to your "SDT" and "Loader" flash files.
4. Open the text file "Mods/$INIT$/Mods.txt" and add a new line with the following text: AnySizeHer_v1_4_1.swf
You will also have to install the mod "PenisRangeV5" (there is a link to it at the top of this mod's overview page).
If you're still having trouble you can DM me. There are also guides on the forum for how to install mods that you can check out.