Merging of conflicted svn:externals properties

We have the following problem/feature request for the svn:externals property:

In our SVN repository, we use various directories with links to other folders in the repository via the svn:externals properties. This allows us to version our software components individually.
During development, we often have to set some of the links from a tagged version to trunk or the other way around, or switch component versions etc...

It happens more and more frequently that the svn:externals property conflicts when trying to update or commit to the repository.
TortoiseSVN then only allows me to use 'their' or the 'local' property or change the svn:externals by hand (see also appended screenshot of the dialog).

Is it possible to use the TortoiseMerge tool in such cases as it would be done when merging a file?
It would be very helpful when the diffs are clearly visible and not every 'external' must be changed by hand.
Thanks in advance!

Greetings,
Erik Henneberg

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We are using
TortoiseSVN 1.8.2, Build 24708 - 64 Bit , 2013/08/27 19:20:39
Subversion 1.8.3, -release

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