!!! THE FEATURE IS IMPLEMENTED TODAY !!!
1.https://forum.renoise.com/t/play-a-selection-of-a-sample-in-any-note-instantly/41105
2.https://forum.renoise.com/t/give-us-loop-fine-editor-back/39802
3. ???
4. profit!
edit; made my post a bit less provoking to the devs - sorry 'bout that ^.^