Hi Miro again
since CB version 1.xx there a lot of changes on the API so i think its not possible to make an Application for CB < 1.0 and > 1.0.
you can set the version tag to
<version>1.0 RC 2</version>
for all Versions above 1.0 RC 2. or 1.1 for the new version of CB only...
The cbinstall version indicates the CB installer version for compatibility check. At the moment i have only tried 4.5.3...
a own version tag for your plugin seems not to exists. I think the only way is in the moment over the description.
Greets