Yes, not only is there the letter yaa/ي , which is y/ii, there is a shadda over it يّ which elongates sounds. No one has ever explained the purpose of all this. Is it supposed to double the "ii" sound to "iiii", which doesn't make sense, double the "y" sound to "yy", which also doesn't make sense to me, or something else like indicating something grammatical? Then, as you mentioned, there is the kasra under the raa رِ which is "i". It can't be "iiiii" but it sure looks like it, doesn't it?
The Arabic for "Tunsisian" has the same set-up.