F2-Text Editing Features

[hseiken]

When editing text using F2, it's difficult to make corrections. Having some facility to treat all inputted text during a single session would ease with formatting the text and making corrections while typing out text.

I don't have any suggestions on how it can work since F2 allows moving the cursor all over the place and there's no real 'boundaries' of text. Initially, my only suggestion would be that entire board is treated as the input area and backspace/delete will move everything back one character.

I can't promise this will have the desired effect, though...I leave it to the experts to figure out if this is doable or even useful.