Case formation on word final rr and ll

[kewnya txamew'itan]

We know that words ending in o and u already take the consonantal genitive ending so, when I was writing a sentence in na'vi that required the genitive of zusawkrr I thought, how do words ending in rr or ll form cases?

The normal vowel suffix is normally divided -l/-t.i/-r.u/-y.ä/-r.u which cannot work on words ending in rr or ll unless they are on there own and, because they must be in an open syllable, this syllabification would be illegal.

So my question is, do they take the consonantal suffix (as they are only pseudo-vowels) or does the syllabification of the normal vowel suffix change?

Personally I'm leaning towards the consonantal suffix because otherwise you'd end up with absurdities like zusawkru or 'ewl being the dative of future and the ergative of plant respectively.

[Carborundum]

In the old word of the day thread Taronyu uses the consonant ending, and no one saw fit to complain. I can't find a Frommer source, but until he says otherwise I think it's a fair assumption to keep using the consonant endings.

[wm.annis]

Personally I'm leaning towards the consonantal suffix

Which is the correct choice.  Confirmed by Frommer when he looked over my grammar cheat sheet.

[kewnya txamew'itan]

Irayo, my search-fu was too weak. 

Anyway, glad to see that for once my hunch about the language was right. 

Edit: I've just noticed just how bad by search-fu was, I even looked at the cheat sheet looking for a reference to it and didn't notice that bullet point. I fell like such a skxawng.

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[Txur’Itan]

That grammar cheat sheet should be pressed on gold leaf and framed.