influence objects for modifiers and particlesystem (Effectors)
This is a incredible useful feature in many other programs like cinema4d(mograph) and maya(mash).
It should be easy to replicate this behavior in blender. There should simply be a button on every possible modifier and the particlesystem to generate a domain object and one for the falloff. Inside this domain could be a plane placed for generating a vertexmap based on the falloff on one side of your choice or a custom object like a sphere. Maybe there will be a better solution for this with the upcoming object nodes, but anyway some feature like this is missing in blender and would make it much better for motion graphics.
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Blender's earlier particle systems (like the one in 2.4x) had reactor particles that would provide some of this functionality... though not to the degree you're describing. There's been a lot of discussion about ways to bring them back and more.
This might be a note to keep an eye on for the upcoming particle system refactor. That said, it would be really helpful if you made mock-ups of what you'd imagine the interface and workflow might be for actually using this feature in Blender.