We do understand the seriousness of this problem and we do not underestimate it in any way. We want our products to have as few issues as possible and we are working hard every day to make this happen. We are giving our best to create usable and performing products, but sometimes this is more challenging than it seems.
The Report Designer is actually part of the Visual Studio and operates in a very complicated environment. As such, it heavily depends on the whole IDE system, just as the system depends on the Report Designer. Its development and improvement is time-consuming and requires extensive research. We also need to make sure that everything works - we do not want to break Visual Studio, because this will impact our clients' daily activities in a very unpleasant manner. I estimate the whole process to take us four to six weeks once we start working on it. There a few things that our developers are currently working on, and I can assure you that they will switch to this problem as soon as they finish their current tasks. Actually, we had to drop a couple of smaller features from our plans in favor of this issue.
This is with high priority on our ToDo list and will surely be fixed for the April release. In case we manage to resolve it before that, we will provide a build (be it beta or pre-release) which you can use to continue with your development. My estimate this to happen is a couple of weeks before the official release in April. This is the best we can do, I am afraid, because the issue requires a lot of work.
Please, let us know whether this is feasible with your projects.
the Telerik team