As I’m sure you all know, the Master was able to escape after Mark of The Rani by detaching the rani’s console room and travelling in that. Now maybe the whole detaching pieces off from the Tardis AND travelling one or two jumps inside it is a bit of a stretch but it would be cool to be able to jettison  region of the Tardis and then find it pop up on a random planet (perhaps re-attach it as well but again maybe that’s a stretch). That would be awesome