Michael Kaplan, author of MSKLC, reports that not only is the limit on UTF-16 code points in a Windows keyboard ligature still 4, it is likely to remain 4 for the foreseeable future:
http://www.siao2.com/2015/08/07/8770668856267196989.aspx "People who want input methods capable of handling more than four UTF-16 code points really need to look into IMEs (Input Method Editors) which are all now run through TSF (the Text Services Framework), a completely different system of input that allows such things, admittedly at the price of a lot of complexity." This should settle the matter. -- Doug Ewell | http://ewellic.org | Thornton, CO 🇺🇸
