Typically what I’ve seen and done in many other development environments, is when you are adding\removing a feature, fixing a bug, or anything like that, go ahead and put it in its own tag. Tags to me are like releases and trunk can be thought of as experimental; it may or may not work.
Specifying Stable: <ver> in your readme will instruct WordPress to make that version the most obvious one to download. That way, you can do whatever you want to the trunk and no one should get mad (they’re supposed to use the stable one right?)
Once you’ve made a handfull of changes and your version numbers have climbed and you’re ready to specify a new base level that you think everyone should be using, update the Stable tag in the readme and commit your changes.
