You will not indicate which version of Visual Studio you have, but in VS2012 you can create a key combination to create the current project.
Select “Tools / Options” from the menu, and then select “Keyboard” in the “Environment” section and find the desired action to assign any key combination that you like:

Just click the Shortcut button and press the key combination that you need.
Having said that, it is usually for the solution to contain related projects, and for some or all of these projects to have dependencies, for example, a static lib and consuming executable file. As long as all other projects in the solution have already been built, pressing F7 to build the solution will only build what is needed based on what you changed. Thus, there should be a bit of overhead.
If your solution has grouped projects for another reason (for example, as part of a larger assembly), you can always create a separate solution that simply contains one project, and then use F7 without having to make a key combination.
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