Unfortunately, most fonts do not have all the necessary characters for Semitic transliteration. Also unfortunately, the license agreement of Microsoft fonts like Times New Roman do not allow for any modification so as to include additional characters. This is why I chose an Adobe font to include the additional characters as the license agreement allows modification for personal use. These are the characters I added to Minion Pro (which comes free with Acrobat Reader) so as to support Semitic transliteration:
So what I do is now use Minion Pro as my default font. When a publisher calls for the use of Times New Roman, I use this for English text, but for transliteration I use Minion Pro.
Due to the license agreement, I'm unable to supply the modified fonts. But I can supply a program I've written to add the additional characters.
Update_MinionPro
Regards,
David.