. Is there a way to "slow down" a motion effect, eg. horizontal image zoom in or out, or particularly on still clips,,,left to right zooms which look clumsy when
they move past the edge of a still image? (it appears worse with smaller pictures in widescrreen mode
2. what does still image default duration mean?
3. What does pre roll and post roll refer to?
Preset effects are just effects to which keyframed animation has been applied.
You can certainly modify a preset in any way, even slowing it down, just by editing or moving around the keyframes. The further apart the keyframes are, the slower the motion.
You can learn the basics of keyframing by typing "Keyframing" in products search box at Premiere Elements support site http://Muvipix.com. Or you can pick up one of my books, which will show you step-by-step how to create and edit them.
Pre-roll and post-roll are functions of rolling and crawling credits. The most pre-roll you have, the longer until your rolling text appears on-screen. Likewise, post-roll determines how long after your text rolls past the title remains on-screen. Rolling and crawling titles can be slowed down by making the title longer on your timeline.
Again, this is all explained with illustrations in my books, if you're interested!