http://mwo.smurfy-ne...c0c48959467e599
Besides the general roles of scouting/capping/harassing/etc here is what the JR7-F is good at.
Legging
The JR7-F is particularly good at legging, better than the other lights by far and a bit better than the other Jenners as well. Having 6 lasers provides fast, precise damage. Made easier when people have weak leg armor.
CapWarrior
Similar to capping, except you have the firepower and precision to stand your ground... and the speed to bail if things turn bad.
Ninja Backstabbery
Using your speed to remain behind an enemy and your precision to shoot their back when able. Use cover to remain hidden or "drop aggro".
Kiting/Squirrel!
For some reason when people see a Jenner they forget what they're doing and become fixated on it. Some people can resist doing this, although they still want to and in moments of weakness still will give chase. You can take advantage of this by using your speed to stay out of their range and lure them away from your team. This will turn their backs to your team and spread the enemy out or even split them up.
All Jenners can do the above things, the JR7-F just seems to do them better for now. As with any light, always keep moving. Here is a video demonstrating Jenner tactics, using my JR7-F:
You may question the effectiveness of legging, it is good if you are doing it solo, coordinated or if the legs are already exposed. If pugging and your team is nearby just go for the core as that's what most people do, or if the core is already exposed. This video demonstrates how effective legging can be:
---EDIT 10-7-13---
Here is my JR7-D loadout. It runs hot but that encourages you to stay on the move always. Here's some gameplay of it, using the above tactics:
Edited by Indoorsman, 07 October 2013 - 09:26 AM.