A good DeFault...!
I can see where a few lists would see it as undesireable. That leaves 3 choices;
- Deny it and continue.
- Allow it, optionally, bit once set as Mod-Only, no going back. (Some things act this way now.)
- Make it an Owner-Choice at any time. Moods change
I favor the last. But maybe you'd want it to popup a red warning, (for new/inveterate owners,) or put it in "Advanced Options."
Bugs come first. Consider 'fixing' this if you need a change of pace.