And here's how you do it in Fruity without the piano roll:
To do this, you need to know how to get to the Shift feature. To do this, click on the sampler channel you are working with. Then you can either press and hold the "G" key (this won't work if you have set Options > Typing keyboard to MIDI), or you can click the Graph Edit button. This is the little button at the top of the Step Sequencer window that looks like a graph. For more info on the Graph Edit function, go to Help > Contents, then expand the topic Step Sequencer, and click Graph Edit.
Now, on to the procedure...
1. Select the channel you are working on.
2. Click the Graph Edit button, or press and hold "G."
3. Add steps on step 1, 3, 6, 9, 11, and 13.
4. In the Graph Editor, scroll (using the clider at the bottom) to "Shift."
5. Adjust the Shift amount on steps 3 and 11 to 0:32. (The amount you have adjusted the step to is listed in the Status bar at the top of the FruityLoops window, under the Help menu item, while you are adjusting values.)
6. Adjust the Shift amount for steps 5 and 13 to 0:16. Voila! Quarter note triplets. You'll have to figure out how this math works, and eighth note triplets, on your own.
Attached is an image of how this looks.