The launcher is shown on the left-most screen for some user-experience reasons, specifically because the launcher, in it's default auto-hide mode, cannot be shown via the mouse if it's not on the left-most monitor easily. Most people just assume it's broken. Jason Smith is working on a fix for this for 5.0, and that will solve this bug. For 4.0, we can't make such a big change that Jason is doing, so I don't think this should be applied to it either.
The launcher is shown on the left-most screen for some user-experience reasons, specifically because the launcher, in it's default auto-hide mode, cannot be shown via the mouse if it's not on the left-most monitor easily. Most people just assume it's broken. Jason Smith is working on a fix for this for 5.0, and that will solve this bug. For 4.0, we can't make such a big change that Jason is doing, so I don't think this should be applied to it either.