I'm working on 6131 right now. It will be fixed on the next release, which I'm hoping it'll be tomorrow.
As for charts, it'll probably take me a few weeks. The hardest part is usually designing the API, not implementing it. For example, I spent the entire week rummaging on how to add a hyperlink to a cell. I had the following things in mind:
1) cell.Hyperlink = new XLHyperlink(address)
2) cell.Hyperlink = XLHyperlink.Create(address)
3) cell.Hyperlink.Address = address
Where "address" can be a String, Uri, Range, or Cell. In the end I chose #1 because it felt more natural. As I write this I'm thinking of giving you the option of using #3 also (we'll see how I feel about it in the morning).
Thank you very much for the feedback, I really appreciate it.