Happy to see that the DevTools preferences in Chrome will be preserved in incognito windows:
We now persist your appearance preferences (docking position, size, etc) and devtools settings (disable cache, etc) into incognito.We do not persist these specific items into incognito: * console history, workspaces, open files in Sources, XHR breakpoints, global search configuration, breakpoints (JS, DOM, XHR, evt listener), watch expressions. This is in Canary now and will head to beta stable in Chrome 44.
I don’t care for the default DevTools window size and location, so I change it every time I open up an incognito window. This change will remove that one small annoying step.