How do I set the committer with cherry-pick? (or is there a better way to get changes from someone?)

I'm helping to maintain a project, so people send me requests to pull
from their repos.  So I create a branch and then pull their stuff in,
taking a look at the various different commits.  I write the commit
numbers that I want to cherry pick to a file (also is there a better
way of handling this?  it's a bit tedious.  it'd be nice to mark
certain commits for cherry picking and then suck them all in later).
Then when I've gone through all the new commits and chosen the ones I
want, I check out the master branch and cherry-pick those commits in.

At this point the commits are in the repo, but they only have author
information.  I'd like to specify that I'm the one who committed this
change now.  How can I do that?

And finally, is this a good way to incorporate changes from other
devs?  Is there a better way?

Pat