[wesz]

Could you provide some kind of mockups of different bar patterns you would like to see implemented?

[flakes]

That link I sent is an example of standard notation I used when playing set. For accents, something like bigger or smaller circles could work fine.

Purdie shuffle would look like:

       1  2  3  4 
   hh |x-xx-xx-xx-x|
   S  |-o--o-Oo--o-|
   B  |o----o-----o|

Or something like a basic jazz shuffle:

       1  2  3  4 
   hh |x--x-xx--x-x|
   S  |---o-----o--|
   B  |o--o--o--o--|

[082349872349872]

looks like the original TR-808 handled triplets, see p.15 of the manual: https://cdn.roland.com/assets/media/pdf/TR-808_OM.pdf ; for example, the SHUFFLE and BOOGIE on p.13 of the sample patterns at the end of the manual.