Typically, with text editors that install command line tools (and I'm thinking of SubEthaEdit here), you can always install the CLT later if you decide you want it.
My advice would be to not install it (if you don't have to install it, that is) and try the app for a while without it. If you decide that you don't like TW, you'll be able to uninstall cleanly.
But, like I said, it's been a while since I installed/uninstalled TW, so I don't remember specifically if you can uninstall the CLT another way...sorry.