Ok, i have uploaded Version 1.4.
It now checks if the new post is valid regarding the settings (max images/ max characters...)
If it is, then it will merge the post, if it's not, then the new post will be a true doublepost.
I did it that way, because the limit will appear when doing an edit on a merged post otherwise.
Also i have removed a bit overhead of the code.
My test worked well, but i consider it as RC, until some of you can confirm they don't have problems (there shouldn't be, but you cannot be too sure

)