This is the first time we have heard a complaint about this setting. We could do a number of different things…
1) Keep a preference and default the setting on or off based on the preference.
2) Keep your last selection as a user
3) Keep your last selection as a user per title
4) Add a confirmation dialog if the option is checked that will ask you to confirm that you want to set all New or Not OK comments to fixed.
5) Default it to always be unchecked
If you have any preference we would love to hear it. We did put some thought and discussion into this when it was designed but have never had any feedback that this was a problem. Thanks for reporting this!