1. I've other requests like this and "special terms & conditions" will be added in the next release of the app. Now there are an option to add guidelines by category:
2. When you submit a new advert you have 3 fields:
PM and Email doesn't show any personal information, "Other" is a text field and this is always visible.
If you want to hide this field you need a custom work.
3. It's the same, If you want to hide this field you need a custom work.
4. Transaction fee is for the selling not for the advert creation.