New feature for a CS upgrade

[tomtom]

Would it be possible to add support for a "[[sentence]]" in an upgrade?
It could then be used to have whole senteces chaged in a textblock. For example:

Cars are very nice, [[I [plan] to buy one [later] this year]]

The whole sentence between the [[ ]] could then be altered with a nother sentence, but when it is used, it would alos have words with the normal [ ] variable in it. It would make it so much faster to make BIG changes to big articles...