Gwern Branwen
WorkspaceByPos is only useful in dual-head setups. If you open a new window it looks at the position where it wants to go and moves it to the correct workspace - as opposed to just assigning it to the active workspace. That's also very helpful when starting up in a dual-head setup. If you already have windows open and then start Bluetile, they are correctly assigned to the two visible workspaces, instead of all being moved onto one workspace.
Hm. The one it 'wants to go' to? You mean some apps detect that there are multiple physical screens and choose to go to #2 instead of #1, or something? (What apps do this, and why?)
I assume this means that if there are already windows on two monitors, they'll stay on the monitors they're on.