but if you are not willing to add this feature as described that won't change anything
I never said that I'm not interested. I am asking not to continue this conversation in this issue, because the problem you and others have mentioned does not relates to the issue summary. You can see #2, #3, #4, #6, do they relate to the problem you are mentioning.
Are you interested in such an addition despite your answer in #8?
Otherwise it would be better if we create a copy of your module and add that feature there. Commerce Ajax Cart is no solution, at least in my case.
Commerce Ajax Cart was a suggestion as it ajaxifies only the teaser cart (and this what you need as I understand from your comments.. and others). Instead of working on the copy module, won't it be better if you write a patch that fixes the problem?
This is a good thing you have pointed out, thanks, and I would like to get it fixed. Please create a new issue for this this and mark that as bug.
P.S. Patches are always welcome :)