+1 A more native integrated way would be great instead of the workarounds. In the past I have used a freebie recorder vst which you can put on any track in Renoise, hit record in the vst, tweak your sounds live and when done press save to put the recorded file somewhere on your harddrive so you can import the recording back using the diskop;
I’d love to have some kind of realtime recording and automatically consolidating the recorded sound straight back into the pattern editor, dblue ‘slice to pattern’ style (New Tool (2.7 & 2.8): Slices To Pattern). So recordings can be auto sliced as well (on set divisions / transients) and put back into the pattern as note events for moar potential glitching powers 
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