Dalmator, nohup..? Please explain how you start it now.
I was looking into getting it started automatically at boot, but didn't finish (looking at daemons).
I just start from the terminal, with & after it - if the terminal gets closed, you're saying it won't keep running?

On changing quotes, I was thinking, it should change quote a few moments (10s of seconds or so) after being locked. To explain: user takes phone because of an incoming message, or wants to send something; realizes there was a cool quote, finishes reading/writing/whatnot, locks the screen and wants to read the quote (remember, the quotes I use are much longer, some 5 lines of text; the user may also want to show the quote to someone else), so it should still be there.

The next time (a minute later, an hour later, whatever) there should be a different quote; one can reasonably assume that any quote on the idle screen got seen before and / or after unlocking the device.
In between, not so much.

So I would like to know, is there some way (daemon, trigger, whatever) to activate the script to change the quote let's say 20 secs after the screen is locked, but if in the mean time the screen is unlocked, the 20 sec counter should be stopped and reset...?