@teacue:
Yes it's implemented - turn on HOST MODE
Then You have separate set of 96 patterns (8 octaves with 12 notes)
@hteah:
For fillins and intros You can use only the pattrens #13,14,15 and 16
Every time You press START (in play mode) two leds are on - the first shows current pattern (1-12) and the second current intro/fillin (13-16).
You can switch them durring play.
You can also use the Basic Variation and Intro/Fillin switch to decide which variation You want to hear A or B and analogically Intro or Fillin.
Setting "AB" means that first will be played variation A and then B then A then...
Part 1 and 2 is something like pattern length extension. You cannot play Part2 without Part1, but You can play Part1 (with length of 16) and then Part2 (with length 8 as a "chain" for example).
Nepheton hasn't such chain mode as in Drumazon, but You can always compose Your rhythms with HOST MODE

For live playing AB variations and auto-measures or even manual (triggered by TAP button) is quite enough
Hope it helps,
Jacek