Whenever any land is brought or dealt with under the provisions of the Land Title Act 2000 , the application or instrument affecting the same may require the registration consequent thereon, if in favour of 2 or more persons, to be made with the addition of the words "with power of disposition to any" less number of " registered proprietors" to be specified in such application or instrument, and thereupon the Registrar-General shall include in the registration the words desired, and thereafter, whilst such registration shall continue, the number of registered proprietors so specified whilst registered with others as joint owners may deal with and dispose of the registered estate or interest as if they were registered as sole proprietors thereof.