For tripplets you have to use a multiple of 3 lines per beat (I use 12 lines per beat a ton because it allows both groupings of 4 and 3 notes per beat. If you want greater subdivision 24 may be necessary.)
To get velocities when recording make sure that the "Record Tweak" checkbox is checked. After the note is entered you can change the velicity by applying the tweak 0Cxx where the xx is a hexadecimal number representing the velocity you want.
Hope this helps,
the shadow runs form the light, but can never be fully driven back.