As far as I know, Pinyin with tone marks can only be inputted as symbol. You can use Microsoft Word to input Pinyin with tone marks to documents. Like this https://www.dropbox.com/s/xdbe0358mddriz8/Symbol.png?dl=0 And you can also display the tone marks of Chinese words by using the Phonetic Guide of Word. See here https://www.dropbox.com/s/83h08ksm3bmj1bx/Phonetic%20Guide.png?dl=0

There are a number of ways inputting pinyin with tone. Beside Mimi's method, I can input tone marks with my Chinese inputting application (QQ Pinyin Input Method - QQ拼音输入法）. The simplest way: QQ Input provides a feature of '开启v模式 - v mode'. When selected, you can input tone marks by typing 'v8' (a opcode) , i.e. āáǎà. However, the setting menu is in Chinese, if you can't understand, you can add my Wechat: nicedayjohn for instruction. An alternative way is pre-input all vowels into a word file, and copy them when you need. Some input tools (Such as QQ pinyin) can provide an on-screen keyboard by which you can input vowels. However this is a bit complicated and not recommended.