Specifically in your scenario, no, it's not possible. You can either have SVN automatically use your version of the file, or the version someone else committed to the repository - but not both.
You'd need to run:
svn merge SOURCE[@REV] [TARGET_WCPATH] --accept mine-full
if you want Subversion to auto-resolve conflicts using your version of the file, or
svn merge SOURCE[@REV] [TARGET_WCPATH] --accept theirs-full
if you want Subversion to auto-resolve conflicts using the repository's version of the file.
Unfortunately, there is no in-between.