Folders Containing Every ROM for a System?

Hi there.
Is is possible to compile all current ROMs for the lower end systems (NES, Genesis, SNES, etc.) into 1 folder (1 folder for each system) for download? Does Vimm have a policy against this? (In other words, does Vimm have a policy against piracy?) This would make it much easier to download every game for a certain system than downloading each game one by one. (My goal is to have my own archive of every American title for the NES)