Hmm, I have PD14 installed and the Fast Forward hotkey (
Ctrl+F) only works for cycling through the 5 speeds (1x, 2x, 4x, 8x, 16x) in the main preview window. It doesn't work when I use the Single Trim or Multi Trim window in the Trim tool.
I actually just shared the entire PD14 help manual for another user who wanted to customize PD18 to be like PD14, and you can download the zip file from this
post and see if you can find the hotkey you remember using. You may be able to program PD18 to do the same thing.