Hi atiuzlet,
[idea 1] I will check what you mean because I don't know this feature of wordpress, but it could be implemented
[idea 2] Someone on the forum also talked about it. it sounds great for me, added to the todo list, but don't expect it soon
[idea 3] Not sure what you want, you could now specify a time between post of the same user, so for example a 30 sec delay or longer, and it will prevent double post. OSClass is not able for the moment to check for the same title and description. If you have some hundreds of ads it will take a little time and resources to check for it, also, what happen if some users has the same product to sell? We should study this issue and decide what to do.
[idea 4] That plugin needs a lot of work, thanks for the idea
[idea 5] We're currently working on a warning page, it's not easy to make it customizable for every user of OSClass, but it will be eventually released. Also thanks for the suggestion about not showing the images of 18+ ads in the "latest listing", that's a brilliant idea.
Thanks for the suggestions