How to swipe up into Mission Control and then swipe back down again without lifting fingers? Okay, weird and sort of unnecessary question, but I'd love some help if you're able.

In Mountain Lion, you could swipe up with three fingers into Mission Control and then swipe back down to exit without lifting your fingers. Now in Yosemite (and I think Mavericks) you have to lift your fingers before you can do the exit gesture. Is there any way to fix this? I'd imagine there's some terminal code I can run to change this setting.

Basically, I want to be able to enter into Mission Control, see what's open, and then leave again all in one continuous gesture like you could in Mountain Lion.
There is an app called Better Touch Tool. You can download it at their homepage. 

First, you hide preview if there is any, and then select Trackpad on the top screen. Before you start adding gestures, make sure to allow it to control computer in System Preferences > Accessibility



As you can see, I already set up the swipe up and down gestures. Below, you can select which gesture will it be (in this case, 3 finger swipe up and down). And under Predefined Action, you can search Mission control.