Regarding the ramp: Assuming you are referring to an ascending ramp directly following a descending one or vice versa, no this is not possible. See the current rule for ramps 2.7.4 “The ramp will be scored when the robot reaches the horizontal tile at the upper level after an ascending ramp or the horizontal tile at the bottom level after a descending ramp”. This implies that there will be a horizontal tile after each ramp. (So a clarification as in the post about Maze rule changes (C.2) is not required)
It is possible though that there is a “long” ramp, e.g., consisting of 2 or more ascending ramp tiles. This was already possible in previous years. (2.7.3) Only the scoring would change slightly as described by Diego’s post.
@Dieguinilombrin you will need to specify whether the ramp tiles are scored one by one when reaching a certain part of a “long” ramp or only when the full ramp has been completed successfully. Sounds good overall though. Looking forward to the new possibilities for speed bumps 
Best,
Niko