I just bought a license since I love having the "eclipse like" svn client support on a complete checkout instead of just each project - excellent stuff.
The SVN merge operation can be executed in Syncro SVN Client from the right click menu of the Working Copy view, the submenu Modify. It allows for example to merge the modifications made on a SVN branch with the trunk from which the branch was created.
Thank you for the clarification. Yes, there are cases when excluding some changes from a merge operation is really useful but this is not implemented in Syncro SVN Client yet. I logged your request to our internal system.
You can try the new merge support of version 4.1 that saves the revision number of a merge action so that the next merge action with the same branch continues from the next revision after the last revision number of the previous merge.