Wow. Really didn't expect that to be so contentious. Some more context might help here, I think. The character's motto was "magic is applied laziness." (Our whole group was made up of engineers.)
The idea behind the floating chair spell was originally just an alteration so that it would be yoked to someone other than him so he could ride it. I don't remember whose idea it eventually was to use that riding time to scribe scrolls, but it wasn't the original intent of the spell as far as I'm aware.
There are some compelling arguments in here as to why not getting up isn't the worst thing (and it's not), but given the somewhat meta-gamey nature of it and the character's creed, I still think it was worth the sloth point.
As for the points themselves, I never told the players that I would be counting them. I didn't want that knowledge to influence their behavior any, since the only thing it really matters for is which wing of Runeforge is their special place. So it's not like I was saying "Sloth! Shame!" or anything like that, just marking a tally in my notes. Those just happened to be some of the most memorable.
And, to be clear, that player was extremely awesome at using applied laziness to inventively solve problems. The character was a lot of fun to run for, and very appropriately was a conjuration specialist to boot. I think he and Jordimandus would have been good friends if the campaign had lasted long enough for them to meet :P