How to have TortoiseSVN always freeze svn:external

Question

Is this possible with tortoiseSVN?:

Always freeze svn:externals for tags

the scenario is our trunk will always use the 'HEAD' revision for externals, however when we create 'tags' we would like for them to have a revision set for externals to properly 'freeze' them at a specific point in time.

Update

Thanks to everyone for your feedback/info.

Since I could not find anything that would completely meet our needs (tried smartsvn and svncopy.pl) I made a console app that so far has passed all our test cases.

A high level overview: The app takes a repository URL then looks for all externals and adds the last commit revision for them - I do a svn info and get the "commit revision".

The app works with both folder and single file externals.

Here is the source code and complete setup files: http://svnxf.codeplex.com/

Answer 1

You can specify the revision in externals:

third-party/skins -r148        http://svn.example.com/skinproj

See svnbook

Answer 2

Update

Thanks to everyone for your feedback/info.

Since I could not find anything that would completely meet our needs (tried smartsvn and svncopy.pl) I made a console app that so far has passed all our test cases.

A high level overview: The app takes a repository URL then looks for all externals and adds the last commit revision for them - I do a "svn info" and get the "commit revision".

The app works with both folder and single file externals.

Here is the source code and complete setup files: http://svnxf.codeplex.com/