well i've been flying for a whie now and really it is ground handlers responsibility to ensure the a/c is loaded correctly
Bollocks its is the Captains responsibility. There isn't a single thing on that aircraft that isn't thier responsibility. If they delegate to you as a trained crew member you can't pass it to someone else. You give it back to them and then they give it back out again.
I would check your "books" ABP's are specified for emergency exit seats. There is no cravat I have seen in the books that states those seats stop being emergency exit seats in the cruise.
Have a chat with the the front office and see if they are happy with you doing what you are doing. And don't be suprised when they say no. If I found out that it was a regular occurance I would submit a no names and flight numbers ASR to put a stop to it.