Consider keyboard users for form submission

[longrunningprocess]

some users will either paste something and want to submit or possibly type in something and then desire to submit. Both of these use cases should have a convenient way to use the keyboard to submit the form.

consider tabindex=-1 as a technique to remove buttons from the tabbing order or build in the explicit order that allows paste->tab->enter or type->tab->enter can be used to submit the form. Another possibility would be to listen for ctrl-enter or ⌘-enter to submit.