Using a variable for the CVS Home directory

We have several JIRA instances and they are not configured the same way.
At each time we want to move data from one to another, we have to change a lot of parameters :

• backup directory
• indexes directory
• attachments directory
• CVS base directories (we have a lot of CVS repositories !)

The best thing will be to define variables in JIRA pointing to the JIRA home directory as mentioned in JRA-1642, but also the CVS Home base directory.
In fact, today for each CVS repository, we must precise the full path, and if the servers are not configured in the same way, we must change each CVS repository information. In our case, we have 35 repositories to change !
We should use a variable that point to the local CVS Base directory. Each CVS repository should point to a folder that is a child of this base directory.
Then, we could only change the value of the CVS Base directory variable.