I have DS and DST but I usually prefer playing DST solo than DS, with the thought that eventually maybe I'll go back to playing with others.
I would love to see a way to easily generate a world that is either even smaller or basically has all the biomes in one clump (ideally with cave biomes connected by an isthmus or available by short boat ride)
It's basically a hyper-easy mode. What I've done before is search for seeds that are goodish and then try and build them up but I sometimes get distracted/bored with some of the "grunt work" needed to get a really good established game to try things out in.
Is this something that already exists and I've missed? Is there a way to do it without needing to be great at coding? GUI like I can get for ONI?
Yes, I am a basic *****, but especially when I've been out of the game for a while, it's nice to ease myself back into it and a lot of times updates and changes (for both) tend to not be really appreciated until you have enough established so you aren't constantly trying to...you know....not starve 
Thanks everyone for any suggestions/ideas.