How can I disable the text overflow box?

The boss says he does not want to be able to type beyond the boundary of a text box in an Adobe form. I'm not able to make the font smaller nor the field bigger. He wants to be unable to type beyond the edge of the printable area of the field. He often does this, sends off the document, gets it signed, approved, whatever, then when it's printed the overflow text just shows a little plus sign- indicating there is overflow text but without printing it.

I googled and found a list of options, but I don't know how to do them.

1. Limit the allowed number of characters in each field (preferred)

2. Convert the entire form to a LiveCycle form which allows dynamically expandable text fields. (I don't think he wants this but I would still like to learn how)

3. Set the font size to automatic (also not wanted but I want to know how. It may come in handy for future forms.)

4. Use a script to copy the text from the overflowed field to a large field on the last pages of the file on the printed copy. Doubt he would let me use a script.

So out of these I think I really need #1 to serve the boss