This has been suggested before (often the case with good ideas).

However, it does conflict slightly with the ability of World Community Grid to balance work distribution between different projects to make the grid run smoothly, and to accommodate the needs of the researchers.

Just from a computational point of view, doing this sort of weighting is harder than it sounds. Not impossible, but still much more complex than the current scheduler.

So, will it ever happen? I don't know. The techs have other priorities right now.

Don't tell anyone else about this, but I think that our choice of project has much less influence on the total of what gets crunched by the grid than we might think. If you or I turn a project off or on, the work goes to or comes from some of the other crunchers. If the grid's "input hopper" for Project A is overflowing, the techs can reduce the input rates for some of the other projects, and then more Project A WUs will get taken out by crunchers who have Project A among their mix. There would be limits of course.

So, I think you should feel free to switch projects off and on. You could do this fairly often, so that you get your desired average percentage of time spent on each project. There would be some extra load on the WCG servers each time you switch, but my guess is that a switch every few days would be OK.

Please leave the Device Profile option "If there is no work available for my computer for the projects I have selected above, please send me work from another project" switched ON.