Yes you certainly can my friend.
More than 4 bars can be used to make a style more "interesting" and mostly for song specific styles.
While creating a style from scratch is rather difficult, we can copy the already existed 4 bars of the style to the next 4 or 8 or even 28(too many,we don't want to create a ....midi
if we wish.
Let's say you choose 8 bars for the style.
Then as long as the bars 1-4 are identical to bars 5-8 and of course you don't want that,
you can insert a different sound to bar 5.
E.g piano sound for bars 1-4,guitar sound for bars 5-8.
Two different sounds at the same part of the style.
If you don't want the same riff for bars 5-8 go to another style,pick a riff that you believe that will match with your 1-4 bars,take a snapshot with your tablet or I-pad and go to bars 5-8 and put the same notes at the same timing as they were on the other style.
Now you have one riff for bars 1-4 and a different riff for bars 5-8.
(The keyboard can assembly whole parts of a style but not individual bars.So before we test whether it sounds good or not we must do this precedure first)
If you want you can copy bars 1-4 to bars 5-8 and add notes or delete notes or move notes
to make it sound a little different.
All of these can be done by using style creator's "pattern length","assembly" function,"bar copy" and "edit" tab.
About 4/4 rhythms:
The first bar has a measure between 001:1:0000 and 001:1:1919
So this is the length(time) of a whole note= 1919
The quarter note has a length of 0480 (1919/4=480)
So the first beat of a bar is 001:1:0000
Second beat 001:1:0480
Third beat 001:1:0960
Fourth beat 001:1:1440
First beat of the second bar is 002:1:0000
and so on...
Olly Woo has made a tutorial also about these things on Youtube.
I don't have a Genos but I watch them.
There might be a feature,a function,a "trick",or a "workaround" with something that I have missed about what I can do with my psr.