You can customize the Wysiwyg input experience with the following 'WysiwygParams' code which provides a <Paste as Text> on/off Icon and until you turn it off all html, excel and word copy/pastes will paste as text. The example below gives example of some of the parameters available to customize the Wysiwyg.
https://developer.crownpeak.com/Documentation/CMSAPI/WysiwygParams/index.html
i.e. When using this code and you copy from word, excel or html and paste using ctrl-v you get a pop up window asking if you want to remove formatting or not. ( the actual editing icons don't work - i get an error))
<%@ Page Language="C#" Inherits="CrownPeak.Internal.Debug.InputInit" %>
<%@ Import Namespace="CrownPeak.CMSAPI" %>
<%@ Import Namespace="CrownPeak.CMSAPI.Services" %>
<%@ Import Namespace="CrownPeak.CMSAPI.CustomLibrary" %>
<!--DO NOT MODIFY CODE ABOVE THIS LINE-->
<%
WysiwygParams wParams = ServicesInput.FullWYSIWYG();
wParams.Stylesheet = "/Lance Beehler/_Assets/css/style.css"; ! your css reference goes here
wParams.ImageFolder = "/";
wParams.ImageUpload = RelationshipType.Attach;
wParams.ImageBrowse = RelationshipType.Link;
wParams.LinkFolder = "/";
wParams.LinkUpload = RelationshipType.Attach;
wParams.LinkBrowse = RelationshipType.Link;
wParams.DesignEditTabs = true;
wParams.AddButton(FeatureType.Separator);
wParams.AddCutPasteGroup();
wParams.AddLinkGroup();
wParams.AddSimpleStyleGroup();
wParams.AddJustifyGroup();
wParams.AddListGroup( FeatureType.None ); //none is used to prevent separator from appearing after group
wParams.AddButton(FeatureType.upload);
wParams.AddButton(FeatureType.bold);
wParams.AddButton(FeatureType.copy);
wParams.AddColorGroup(FeatureType.None);
Input.ShowWysiwyg("devbody", "dev_body_field", wParams, width: 950, height: 200);
%>
