Edit: Skip to the end to see the results.
I'm starting slowly, with a simple 10 particles in a row, as a cone with no radius, so they're all in a single line.
Then I set the timeshift to -1.0 seconds and set their lifetime to 60s and their initial speed to 400.
Oh yes and I keyframed the particles per seconds from 10 to 0 after 1 frame.
So I have 10 particles that appear instantly and move off together in a line.
But what I actually want is for them to not move at all after they've been created, but even if I keyframe the Movement speed to anything at all, including backwards, after they start moving on the first frame, they ignore it and just keep going.
Same if I change the acceleration or scale. Nothing changes. At all.
I also changed them to a built-in rock shape and that did nothing too. even with the scale set to 1000% and the speed to -4000 after the first frame, it stayed the same size and speed.
What am I doing wrong, how do I get them to not move after they've been formed?