Rather than merging all changes from one branch to another you can pick which changes to merge. This is called Cherry Picking.

Cherry Picking in SVK is currently done using the -c flag to "svk merge"

# merge only change 26001 from //local/Foo to //mirror/Foo
svk merge -c 26001 //local/Foo //mirror/Foo

(Does -r also work for ranges? What about a list of changes?)

There is also the cmerge command but it is currently out of action...

This command is currently deprecated, pending improvements to the
Subversion API. In the meantime, use C<svk merge -c> to obtain
similar functionality.