Classical samples all-time preview section

Attached to the samples are modulation chains, dsp chains, keyzones or you may perhaps even have a sample sliced (in which case you cannot copy/cut/rearrange at all).

In general: The sample section has been moved to the instrument area for multiple good reasons that are attached to these samples and all these attached options are not possible to make these visible on the location where you want to have the samples being made visible.
That classic location was mostly fine when Renoise did not supported keyzones, slices, modulation- and effect chains and even then, that location frankly still was a mess because the sample related properties that did exist, were nowhere near that listbox.

I could understand cutting out samples that you no longer want to use, i could even understand a birdseye view to quickly gaze what kind of samples are attached to your instrument. But i highly doubt copying/pasting and rearranging would benefit your workflow in the new situation because after copying and pasting, you will be forced in 99% of the cases to check upon linked chains and keyzones anyway
You could keep an eye on Danoise’s XRNI Merger tool though, i can see a lot of your ideas fit right in here and then you are also assisted more properly in organisational matters.

1:
You can already stretch the internal filebrowser quite far, but there is just a limit that every kind of software that works with DirectX graphics has to apply somewhere.
I would suggest to use the “reveal in explorer” option in the browser it’s context menu, you can extend this window as wide as necessary and drag and drop to Renoise when needed.

2:
It would be nice if the left side could be extended quite a lot further as well, but if i need to view a full sample name, hovering above the specific sample will reveal its full name in a tooltip, and if you go up and down while hovering, the tooltip automatically updates when moving across the sample slots.

If you detach the instrument window, you have a couple of bars extra space when making that dialog full-screen. But i suspect this suggestion falls in the same scope as the “tab view” discussion.

If you delve into the API a bit, it is not too hard to create dialog views to give you this extended visibilty of your samplenames. Copying and rearranging requires some deeper study but as said:Danoise is more or less already on that.