With the command 'Paste Rhythm' the rhythm of a parameter (i. e. the time pattern of the objects of the parameter) can be applied to another parameter. This video shows some applications (...)
Learn how to edit drum patterns with Synfire. There is no specific "Grid" or utility for this, you simply use the pencil and line drawing tools with Static Pitch Symbols exclusively (brown).
Here are a bunch of midifies, quantized to some well known drum machines. You could copy/paste the rhythm to your phrases, to get a wider selection of humanized, quantize values. Andre is (...)