Maybe you can design your own form and control everything that happens.

John Walkenbach has an enhanced data form:
http://j-walk.com/ss/dataform/index.htm

And the source code is available for a small fee ($20 USA, IIRC).

And if that's not sufficient, then maybe you could design your own input
userform.

Debra Dalgleish shares some tips:
http://contextures.com/xlUserForm01.html

Cydney wrote:

Hi, I'm suggesting that users of a very large spreadsheet use "Data | Forms"
to add or edit data to the sheet. However, for ease of knowing what changes
and additions have been made, I created a macro that highlights the
background color of the cell on the "On change" event of the worksheet. But
it doesn't seem to work when you use the Form. How can I make this happen?
--
THX cs

--

Dave Peterson