Speed editor

Can I use Speed Editor to insert the custom Transitions?

TRANS / TITLE key:
"Press and hold this key to bring up a drop-down menu of your available transitions in alphabetical order and an icon describing their shape.
Rotating the search dial left and right will navigate you through the list. When you find the transition that you want, simply release this key and it will be placed at the Timeline edit point as shown by the Smart Indicator."

–page 56 of the New Features Guide

Thank you. Yes, I can see and use those basic system transitions. I have lot's of custom transitions as well which located inside the same folder, but by some reason I'm not able to see them when trying to use Speed Editor. Maybe I need to save those transitions somewhere else? Appreciate your help!