Is there a way to control the autoformatting of numbers by voice? 

i'd like a way to make all numbers that i am saying from now on to be spelled out - or not. so something that toggles whether '5' or 'five' gets typed. 

'numbers mode' doesn't help, since I am dictating text as well. 

i find it tedious having to go through 'correct that', and then choose the formatting, and then answer the autoformatting question. 

If I would want to create such a command, what would it look like? (In case it doesn't exist yet?)