I have 2 regeneration idea's. 1st idea, lets say if you hold your regeneration for too long and then if you go in the TARDIS, the TARDIS  will start to blow up with fire and bombs and sounds, and you will have only 5m to save your TARDIS or else the console rotor will blow up and then the TARDIS  will be fully destroyed and it will only be able to come back in 4 hours. 2nd idea. when you regenerate and you will have a hand in jar next to you, you can pull all the regeneration energy in the hand in jar and your regeneration will stop. However if you hold it for too long the  jar will still take the regeneration energy  but in a few seconds the jar will just blow up. and your regeneration will continue. 

Good ideas i love the first part apart from the 4 hour thing.

 thanks glad you like them

heres a regeneration idea so if you and your friend is walking along minding their own busyness then you get the idea of giving your friend any amount of regenerations you have 12 and your friend isnt a timelord so he /she cant use the untampered so you give the friend a amount of regenerations of choice eg 5 so you wuld do 

/give.regen 5 "username". then you would press enter so that means yogave them some of your regens so your friend is a timelord it is a smart feature if it even will be very helpful to other people. other than that idea i like the idea from OodieDoctor his idea is great bu i think there should be a option in your tardis for it to redecorate from your choice that way it can feel like doctor who even more 

 The reason i did the 4 hour thing is because in the show when the Doctor destroys his TARDIS the TARDIS needs some to time to fix its self up and re decorate.

um did you guys think about storage?

 I mean I know this is a bit much but for the storage same goes in the show it shows that the tardis keeps the old console room like in the episode “the doctors wife” they went to the tenth doctors console room so it could be like that but it would be a pain to find it like corridors that take a while as well as doing this but depends on what tardis you start of with depends how many rooms you can get like say you started on the 11th tardis you can only use 11th, 12th, 13th but if you use the 1st and regenerate over and over it will lead you all the way up from 1st doctors console room all the way up to the 13th doctors console room.