It is a nice proposal however this is a deployment feature and it is project specific. Each company or client have its own way for making the deployment and different bits of configuration or even different web.configs.
So what you are asking is achievable by making an MSBuild and hooking to that build and changing the configurations or the web.config after compilation of the solution and instead of making a solution properties maybe it will be better if we make a knowledge base article explaining how to make a deployment procedure where you may want to have different configs per different environment and maybe different web.configs as well.
Indeed it will be good if it is build in, in the generated solution as well at some point. Thanks for the proposal.
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