

For a “lean back” editor (as opposed to “lean in” like Vim or Emacs) that’s menu and mouse friendly while still being lightweight overall, sure, why not? Kate is good for that, Geany also good. You might also look at Sublime (not open source) or a clone like CudaText (open source, bit more of a retro UI).
I wouldn’t use those myself but my preferred posture is different. Use the glove that fits.



It can be insanely hard to find any demand for them if you’re talking about trading locally rather than selling online and shipping. That’s probably the biggest real obstacle.
In terms of legal or regulatory issues, no, nothing is stopping you unless maybe you’re dealing in porn-focused games in a state with strict anti-obscenity laws. Don’t lay the 18+ doujin soft out on the Sunday flea market table in front of your local superior court.