I can understand how the Kuru Toga's advance mechanism may not lend itself to cursive as well as printing. Perhaps the Zebra Del Guard MP [no affiliation] might be of interest for cursive writers. Although, I find when I'm writing cursive I'm constantly having to advance the lead and or twist the pencil a bit in my hand.
Tangential to this thread, a long time ago I had a Cross MP that advanced the lead as I wrote - it worked very well. Alas, it grew legs and walked away. Are there any MPs out there that advance the lead as one writes, and do they actually work well? Thanks.
Look at the Pilot Automac. Not an owner, but it's on my list.
Re cursive in pencil, it's no different than in any other medium, imo. Just a style choice. I tend to use just about any other pencil than a Kuru Toga for that though to avoid having to reform the cone tip on the lead.