Please note that this is not a need, but a suggestion: Can a code be added to Renoise to play a sample with a desired amount of fine-tuning?
In many traditional eastern modes (Persian, Arabian, Indian, Armenian, Chinese & etc.) there are quarter-tones in the sequence of the notes in a mode, i.e. half of a semi-tone higher or lower than a note. The Persian mode “Shour” can be a good example:
As you see there are two notes with the 
symbol which is called ‘KORON’ and means a quarter-tone lower. E.g. the second note 
is a quarter-tone lower than A, located between G# and A.
There are many eastern modes like this one with ‘KORONs’ and ‘SORIs’ (a quarter-tone higher) so when I want to make a song in these modes using Renoise I have to do one of the following:
1 – Loading 3 instances of each sample, then fine-tuning 2 of them in a way that they sound a quarter-tone lower and higher respectively, and use them when ‘KORONs’ or ‘SORIs’ are needed.
2 – Generate a sample kit using instrument editor and insert quarter-tone transposed samples in their appropriate locations in the mode sequence.
Now if a code can be added to Renoise in order to play samples with a desired amount of fine-tuning making music in such modes can be done times and times faster, also it will help in virtualization of instruments like trumpet, sax, etc. IMO.
Sorry if it went too long… 
)
) i was too lazy to go through the older topics, sorry. yes the 1st method is usually more handy.