The mouse widget is the little wedge that you see when you are flying your ship that gives you a visual feedback of where your mouse is pointed with respect to center.
I've found that this widget is not available for the SRV, and this makes steering the SRV difficult in many situations. I play on a m+kb, with the mouse being the only analog input device available to me (if you try to steer with a digital input, like the keyboard, you'll spin out 9 times out of 10, even if you're feathering the key). If I only had that visual feedback, driving the SRV wouldn't nearly be as frustrating at times. Driving on planets are great and I have a lot of fun just goofing off on planets, but without that feature it's too difficult to be really enjoyable for the most part.
I've found that this widget is not available for the SRV, and this makes steering the SRV difficult in many situations. I play on a m+kb, with the mouse being the only analog input device available to me (if you try to steer with a digital input, like the keyboard, you'll spin out 9 times out of 10, even if you're feathering the key). If I only had that visual feedback, driving the SRV wouldn't nearly be as frustrating at times. Driving on planets are great and I have a lot of fun just goofing off on planets, but without that feature it's too difficult to be really enjoyable for the most part.