a lot of times there are multiple ways to achieve similar results, for example instead of using tools to randomize volume values, you could also link up a lfo with random setting to a gainer slider in the track dsp tab, or achieve it with a lfo in the instrument editors modulation tab. The YXX command is also handy in setting up a probability on how many times a note event will hit, it also works with note-off events.
There have been more threads on humanization in this forum, i once asked about different ways of achieving less static sounding snares, might be helpful for your quest as well 
https://forum.renoise.com/t/how-do-you-variate-the-sound-of-your-snares-if-at-all/33213