Describe the feature request

Just simply a Tardis landing in another Tardis or itself

Describe alternatives you've considered

TARDIS landing in itself

There has been discussion about this before, back on the old BukkitDev site, but the pages are no longer accessible.
It was decided that this was not a feature that was worth implementing, probably because in the actual Whoniverse it can only happen by accident and would prevent anyone from entering or leaving the TARDIS.

Just saying this is the master landed in the Doctor's Tardis

Not likely to happen anytime soon, unless someone else creates their own fork for it