Failsafe switch - Locate away from the main control rooom, the failsafe switch stabalizes the Tardis in space and time so that it may neither materialize nor dematerialize. An inexhaustible wardrobe of costumes available. It sounds obvious, but it's easy to overlook. A large block of technological wizardry, the main power generator houses an amout of Zyton 7 - an essential substance used in harnissing the power of the Eye of Harmony. Particular emergencies may make it necessary to shed par of the Tardis's internal structiure, and the ctrols allow rooms to be jettisoned.
New rooms look like Victorian ironwork unless programmed with specific features.
If desired, multiple secondary console rooms may be constructed. Scondary console rooms may be turned into the main console room by the Time Lord owning the Tardis. Sonic Screwdriver - When the Technobabble Toubletalk Generators fail, use this Plot Device to get out of your nasty situation. Beyond that, a Time Lord, in his long years of travel, could have collected anything. Weather or not each item is documented or even remembered by the Time Lord is a whole other matter.