May I take liberty to suggest regarding the topic..
After Jeroen's query I tried out basic Google voice inputs; it indicated user voice route was at all feasible. Anna so gracefully shared her math scripting experience with others. At the end she said:
" Hope something here can help you out, too."
... in fact leading a way for more gifted.
An additional feature provided to SE Math users converting speech to symbolic math text would be most welcome by users as can be seen in their overwhelming responses.
Any subscriptions needed for related outsourced task would be readily met by users it appears.
It also suggests the next step .. an initiative by SE Math Meta for such a provision here, a means to key in by voice would be appreciated by one and all, able or challenged, at the keyboard...