A tad bit offtopic but Sugar is far from the worst resource in the game. Because its base! yield-enhancement without fitting improvement is +1 Food (if I'm not utterly disremembering) and food is usually by far better than a bit of commerce. It just doesn't make much sense to improve all those sources with plantations. Especially if running Agrarianism + Aristocracy (Farms with full commercial and food benefits ftw.).
And like cotton its often clumped together and riverside. That evens the rather lousy improved yields out a bit. Its also a reason why its not all that a bad idea to directly settle on it... (especially true for cotton.)
3-5 enhanced Tiles (rarely even so much as 7 is possible) in the Fat cross + a happiness resource to settle on without regret.
Even with its crappy yields if improved with a plantation. If improved otherwise even 3 sources of cotton roughly should even out a source of Gold (as do 3 sources of sugar a mix of 1 health resource and a commerce one.

). And few players scoff at Gold near their starting position. Its just less obvious. Just cottage/farm those cotton-tiles allright.
Silk seems to suffer from simmilar problems but offers neat early-game yields prior to any economic techs...
But surely it doesn't compare to dye which offers all this and a real neat yield if improved with a plantation. But then again: Thats often covered in jungle. Cotton doesn't seem to be covered by foliage at all unless growing to that tiles during the game.
I whould rather call the worst Luxury resource to be had overall is ivory (save the source from dragon bones naturally

.) but very neat one to settle on if in Plains.
Oh, and Fall Further has its own subforums now.
If you report your problems while playing that mod (no matter if it seems! to be a problem of the main game. It very well might not.) there you help both the development of this modmod as the one of the main game. And bugs stemming from unmodded FFH2-code will find its way here. Rest assured. Xienwolf and Venhem are very involved in fixing those as well anyways.
So chances are if you report a bug in your FF-Version of FFH2 and put the bug there instead of here it even gets fixed faster than here.