What is the best way to backport a feature?

Hi,

Suppose I have the following situation:

  o--o--o                    Release_1.0
 /    \  \                  
o-o-o--o--o-o-o-o-o-o---o--o Mainline
     \       \       \ /    
      F1--F2--M1--F3--M2     Feature_A

Now I want to backport "Feature_A" to the "Release_1.0" branch so that it gets included into the next minor release, i.e. I want to apply the commits F1, F2 and F3 onto the "Release_1.0" branch. I cannot just merge "Feature_A" into "Release_1.0" because that would also bring in the merges M1 and M2 so a lot of other stuff from the Mainline.

I played with cherry-pick but that means I have to manually find the commits F1, F2 and F3 (which in reality could be many more if Feature_A is big) which is not very nice.

I also tried 'rebase -i' but that means I have to manually delete all the lines for changesets from the mainline. Also not very nice.

Is there a better way? To me this scenario sounds not unusual but I could not find a solution.

Thanks, Peter