Just a small update this time - I've added the ability to switch comments off on a per diary basis or on a per entry basis. If you switch comments off for your diary itself, then you cannot have comments on any entry. If you switch them on for your diary, then you can choose on an entry by entry basis.
Switching off comments will not delete existing comments but they will no longer be displayed - and of course no-one can leave new comments.
I will add a setting when you're creating an entry - but at the moment the setting is only on the 'view' screen. Of course, it will only show up if you're the diary owner. As there was no ability to adjust comment visibility until now, I have made the default to be to show comments.
This is the first step to help provide some control for diarists over the comments left on their diaries. Over the next few days I will also add the ability to delete comments, and to block/report users who abuse the system.
As always, feedback welcome!