Gota love it when you find a 6+ year old enhansnent that has not been solved in Netsuite yet. 410096 Release Preview 2016.2 > Case Record > Enable Spam Lock Button > Should have NetSuite UI preference or feature > Show/Hide button

"that's an enhancement" has got to be painted on the outside of the building at NetSuite support. I like it when my own team goes "oh great, it's an enhancement, when do you think they'll get to it?" and I love to reply "sometime between 6 months from now and the heat death of the universe"