assuming we are talking about clipboard help+spell, you can do it even easier than you say
1) select the text from any app
2) hit ctrl+alt+v (or whatever chs shortcut you have set in the capture tab). the will capture the text, launch chs and show it with spelling errors underlined.
3) press spellcheck button (maybe i should have an option to have this trigger automatically?), and do your spellcheck.
4) now press the icon that looks like a clipboard with an arrow leaving it to the right, that will copy the spellchecked text back over your original text.
you can use the same process for doing quick formatting of your text, not just spellcheck.