Came up with a fix... And it deals with all of the possible combinations that we have discussed.
Thank you for the suggestion of Application.Undo. I'm including my resulting code, if anyone would care to accomplish what we've done, and for the length of time that this message will remain on the site.
Of course this "fix" may tick off some users, but let me tell you it is for the better interest of the group than for the one individual that might think to select say all the sheets and potentially overwrite all good data, just to fix one possible mistake on a single sheet. Anyways, the following code works like a charm, thank you each and every one for the assistance. Plagiarize away.
Option Explicit
Private Sub Workbook_SheetActivate(ByVal Sh As Object)
If ActiveWindow.SelectedSheets.Count > 1 Then
ActiveSheet.Select
End If
End Sub
Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Excel.Range)
Dim CellData As Variant
Dim CellLoc As Variant
If ActiveWindow.SelectedSheets.Count > 1 Then
ActiveSheet.Select
CellLoc = Target.Address()
CellData = Target.Formula
Application.Undo
ActiveSheet.Range(CellLoc).Formula = CellData
End If
End Sub
Private Sub Workbook_SheetSelectionChange( _
ByVal Sh As Object, ByVal Target As Range)
If ActiveWindow.SelectedSheets.Count > 1 Then
ActiveSheet.Select
End If
End Sub