The Official Strategy Guide for Starship Titanic (included with the First Class Cruise Kit, which I purchased circa 2000) contains a description of the cellpoint settings for each bot. I've attached a photo (well, technically two photos combined into a single image) of the relevant pages, but here's a summary:

BarBot
Top dial (small disc): Charm
Middle dial (medium-sized disc): Honesty
Bottom dial (largest disc): Ability to Come to the Point

BellBot
Top dial (dome): Helpfulness
Middle dial (switch): Just Passing Through
Bottom dial: unspecified

DeskBot
Top dial (right switch): Gossipiness
Middle dial (left switch): Niceness
Bottom dial: unspecified

DoorBot
Top dial (left switch): Optimism
Middle dial (right switch): Memoriousness
Bottom dial: unspecified

LiftBot
Top dial (left switch): Health
Middle dial (right switch): Garrulity
Bottom dial: unspecified

This raises the question of what the position of the bottom dial indicates for the bots that aren't the BarBot; perhaps it's simply random.

Interesting.

The guide also claims that the DeskBot's Gossipy and Sweet/nice cell settings can change randomly and can be optimal without changing her setting (pg 112). I don't think I've ever seen that happen though.