I try to do all flight idle descents at work, and I use the FMS to help me out with that. The only problem is the profile of the descent. We do .77 in the descent and transition to 320kts. In order to do that flight idle you need about 4,000ft/min. Sometimes that can be a little too much with passengers on board, and I will only do that if I'm getting a big descent over with over 10,000ft difference (like F220-10,000). Come to find out recently the company checked with Bombardier and passed the message on to us that the .77/320 was supposed to be a power assisted descent (not flight idle), haha, so they are altering the profile soon.
Sometimes if I'm doing a crossing restriction on an arrival that is also a speed restriction (like 250/10000) I will create a fix 5 miles prior to the restriction point, aim for that and finish my descent. Then I'll just take the 5 miles straight and level to slow from 320 to 250kts. How does everyone else do it?
Back to the creating fixes, if I entered KMHT/-30 to make that 30 mile this side fix, it would display on the screens as a waypoint called KMH01 or something like that. Well I think that's boring, so I always make a name up for my fixes, and since I went to Auburn - it's typically KMHT/-30/AUBIE or TIGER - and that creates the name for the fix (for all those CRJ guys that may not have known that). Your fix name can be as little as 1 letter, or it can be up to 5 letters.