Interesting I just noticed my bank now gives me the option to transfer money on my mortgage, so it goes straight to the principal. Adjusting the payments by filling out a form has always been an option and I'm already doing higher payments, but was never able to just do random lump sum extra payments like that. I had a bit of extra money in my main account and just tried it and it worked.
My goal is to try to have it paid off by 40 and I am close to being able to do that, especially if I start making extra payments.