[Unity 4.3] 2D physics - SpeedUp Platform/Slope [C#]

Hey all!

I'm currently developing a little 2D Platformer game which involves jumping through a 2D World. My goal is to get the player speed up on Slopes downhill(like 45°) and on specific horizontal "Speed Up" Platforms.

Furthermore I'd like to have the player sliding a lttle bit(in horizontal direction) after getting on the ground after a jump.

I discovered the 2D Physic Materials where I can adjust the Friction and Bounce value from 0 to 1. But the friction property does not deliver the function I was aiming for

I tried to write two little scripts that I attach to colliders where I either speed up the player or have just a little gliding effect after a jump.

For slopes I thought abouth getting the tangent vector the player has according to the surface and speed the rigidbody2d up in the direction of the tangent vector, but I didn't have any idea how to tackle this. Same with the gliding feature..

Do somebody has a little hint or script example where I can go from and investigate further more?

I would be really glad to hear from you guys!