Well if we had a Forum for that, i could. But we have not.
Yes, It's called UserVoice -->
http://osclass.uservoice.comI think you are complicating things, without the need to be complicated.
1. A user registers and wants to post his ad.
2. But his item must go within 10 days or so. He has NO way to select the ad duration or even close to his needs. An other user wants to post an ad for his service and select a long-time duration. He can't.
Yes, he could.
Please, check ItemForm::expiration_input() and ItemForm::expiration_select() functions
They wasn't added to the bender theme, but they're there.
3. The user's ad is about to expire. He gets a notice about it. He must delete the ad and post it again. I don't really understand why he simply can't repost it. I don't see all those options you mention. Why different id ? Why limit how many times he reposts it ? Why all those complicated things.
Still, you didn't answer if the publication/modification date should be modified or not.
Why should the ID change? Because some people has already asked for it.
Again, we have heard very different opinions in this particular area, we let some space to people to create some plugins, afaik none exists yet, then we'll work on it.
So, will Osclass have some basic SEO or not ?
As I already told you, yes, a person (expert or not, that's up to you), that knows more about SEO than any on the team is currently reviewing Osclass and making some suggestions