I developed a simple maxscript that extremely helps animation. I don't know if there is a hotkey for trajectories, but I developed this maxscript.
/* TRAJECTORY Created by: Jonathan Reyes // May 23, 2006 */
rollout trajectoryToggle "Trajectory Toggle"
pickbutton pick "Show Trajectory" width:200
on pick picked obj do (
if obj != undefined do (
obj.showTrajectory = true
pickbutton pick2 "Hide Trajectory" width:200
on pick2 picked obj2 do (
if obj2 != undefined do (
obj2.showTrajectory = false
This is a rollout that has two buttons... You click on the top button, and then click on an object, and it shows the trajectories for that object. The bottom one will hide the trajectories for the button. I have found this to be a very useful tool.
I actually made this a macroscript and incorporated it into a right click menu. This is a great way of doing such stuff in a speedy matter.