There is a Touchpal keyboard in Cydia, actually.
Just search Touchpal, and you will find two tweaks from BigBoss. They are both Chinese, but don't worry, there is an English version hidden in the app. The one you want will say Touchpal Keyboard. Just download it (it's free), and when that's done, you'l see a Touchpal icon on your phone. Ignore that (unless you can read Chinese) because all the settings are in Chinese, and you won't need to change any of them anyhow.
Go into your phone's settings, and add the keyboard "Touchpal (English)". Now go into an app that uses the keyboard, like Messages or something, and press the globe in the bottom left of your keyboard to switch to the Touchpal one (note: the label for the keyboard will be entirely in Chinese). You'll see a keyboard that looks like a phone number pad with letters. Now just swipe from right to left across the keyboard, and boom, there it is: a perfectly functioning Touchpal/Swype English QWERTY keyboard.
I don't know why BigBoss only has this as an option bundled into a Chinese keyboard app, but I'm glad I did the digging to find it. It's so much better than iSwipe. Hope this helps!