Hmm. What're the equivalents of the following:
1. Execute Modification ./$sourcedir/Register.php File not found
2. Execute Modification ./$sourcedir/ManageRegistration.php File not found
3. Execute Modification ./$themedir/Register.template.php File not found
4. Execute Modification ./$themedir/Who.template.php File not found
for ElkArte? I think once we change this, SFS should work... but I'd need to test this further.
Edit: I'm kind of an idjit, forgive me. I'm still working on wrapping my head about SFS... after not having touched it for a while.
Interestingly, the mod can be added to ElkArte's Package Center with little to no issue... at least, right up until you try to install it. Which causes the above error, naturally. So, for the most part, the code seems to work without too much of an issue... with the obvious need to modify the SFS code to point at ElkArte functions and such.
Edit2: Ah, discovered where Register.template.php is. It's in themes/default/Register.template.php
Edit3: Making progress. Kind of. I've now got it to correctly detect the location of Register.template.php... we'll have to obviously correct the code to work with ElkArte, though.