assassination abilities

At first I was going to make this a suggestion to remove speed potions, but I decided to make it a rant instead. The speed effect is fun to play with. In duels, it alters how people fight. In FFA, it's what gives the otherwise weak Samurai and Ninja (and Alchemist, I guess) classes an edge. But...

I have an idea for assassination... Maybe there can be added some abilities like... Example: If you kill someone you get for 2 a 3 seconds speed Example 2: Decrease fall damage if you jump from a high place (upgrade is possible) Also many more... +1 if you like it?