Even if you were using a tablet, good or otherwise, it is not that "easy".
The way a photoshop brush work is based a "base image". You can alter sertain aspects of how that image is "painted on" the canvas via the brush attributes pannel.
For example, if you started with a round brush ( a circle), you can elongate it by using axis /and angle until you get a roughly eliptical shape. Even if you matched the sample shape you presented, as you move your mouse ( or pen, on a tablet) that shape would be repeated over and over matching your movement ( thus it will no longer look like that shape but an extrusion of your brush shape). After all how could PS possibly know where you intend to taper the line?
If you use a tablet, you can achieve this effect ( and you'd not need to mess with brush dynamics) , but it takes a fine hand to get the modulation right and it cant be done "automatically" by PS.