Multiboxing should not be considered in game design ???

[Nisch]

To be able to multibox the game needs:

follow and assist options
some sort of party mode to share credit for questing/looting
customizable macros
windowed mode

I think any mmo not adding those in a rudimentary form is doomed to begin with. Unless the mmo is an FPS hybrid that is more based on the mouse targeting than sticky targeting which I think multiboxing wouldn't really work in the first place.

The last two are not necessary. I boxed in DAOC, which did not have a macro system, and macros were very illegal in that game.

Second, if you hardware box, you don't need windowed mode.