My thought (I don't have one yet) is that I would keep it locked up when I was not in the room, and have it unlocked when I went to bed.
I think the 1242 RLS might be new or I haven't seen it yet. The only reason I don't have one is because I rent in a house with plaster and lathe and the work to do the inserts is just too much PITA, even though the landlord said he didn't mind as long as it looked good when I left (which would pretty much mean leaving the insert in place). The 1242 just jumped to the top of my wish list.

