One possible solution is to run (and have your friend run) StarCraft II through Steam. Steam is much less expensive to keep perpetually open than StarCraft and alerts your friends when you enter a game, even when you're not in any game.
Steam accounts are free, and it's a good place to keep all your games organized so that you have quick access to them in one place.
Most marines are "resocialized" former criminals, convicts, etc. with reapers and firebats being particularly egregious villains pre-rehabilitation.
The key difference with Tychus, is that Mengsk knew he had a history with Raynor. Perhaps resocialization engenders massive personality and memory change -- quite simply, if Mengsk wanted to use Tychus to get a pawn into Raynor's forces, resocialization might kill the connection.
So Mengsk needed some other way to ensue Tychus' loyalty. Hence the prison-suit.
What I can't tell you is why Mengsk wanted Kerrigan dead more so than Raynor, especially after Media Blitz. Perhaps the implication is that Tychus was always a spy to Mengsk, and when Mengsk saw an opportunity to hurt Raynor, commanded Tychus to kill her, even if that hadn't been his original intent in setting Tychus free.
On an unrelated note -- without Kerrigan, I'm a little bit confused as to who is going to be the central character for the Zerg expansion campaign. :/
*No information above can be considered canon, and is just the random speculation of a fan.
Best Answer
You can add the Subtitle in the cinematic, as iber pointed out in his answer in the Options menu.
Now the transcriptions. (forgive-me if I made some mistakes, not my primary language)
Starcraft 2 Wings of Liberty
Source
Starcraft 2 - Heart of the Swarm
Source
PS: I wrote the WoL too because I watched it first and only when I finished the transcription I noticed that it was not the HotS =X
PS2: As pointed out by iber you can do it in-game, without too much trouble.