The scenario that you described is by design and expected. Once you set a custom name we do not change it in any way, even when you data drive this test step. I am curious to know what are scenarios when you see different behavior. I will do my best to reproduce them and fix any potential bugs.
You can submit a feature request to append data driven information to custom name and we will evaluate it for future releases.
If you want to see information about the data driven step, you need to reset the custom name. You can do that by editing the name and then clicking on the "X" icon (see resetCustomName.gif).
The edit forum post feature has been discussed previously and our position on this topics is that we do not plan to implement it as of now. The reasoning behind this decision is related to the fact that the forums are on of our main sources of feedback. Additionally, we monitor the forums and strive to answer all customer questions related to our product. This is why we need to have accurate records of the communication and keep track of unanswered questions.
Thank you for your understanding and feedback.