Forms: Legacy tools - text box

Hi,
I have a form and I found it useful to use legacy tools that make it possible for text boxes to be formatted specifically (Numbers, with input masks, caracther lenght and all). Fine.

But there are two problems that I can't solve with that path:

1- The lenght of the "grayed" lining is short, I want it to go for a specific lenght for esthetic reasons, or for another reason, I'd like to have the user input account digits in a 9 box area, banking institution number in a 3 box area, and transit in a 5 box area. I'm sure you've entered one of those in your life already.

2- Once the page protected for form content only, the user can still press enter once in the text box and create a lign, like it would in regular text. How can I avoid that? Regular form text box don't do that...




Anyone savy?