double the humanization with note length variation

[Steve]

This only applies to MOTIF tracks. 

Yes we can create new rhythmic patterns where we use the TIEs to make the NOTE-ON/OFF interval longer.

Did you mean REST not TIE?  Clever! Yeah you can use the Rhythms with RESTs to make a gate effect :-). The nice thing is the rhythm repeats so if you use a 4 beat Rhythm with beats 2,3&4 as RESTs you get a 25% gate on.   Certainly not optimal but can make due in a pinch. 
Steve