Hi Tomomi,
There are kind of three levels of extra stuff that can be achieved once you hit the limits of Styler:
1. Source Edits (XSL-FO, FOSI)
2. Switch to APP engine and use APP source edits
3. Implement a native APP template
In the example you give of bleed tabs, I believe this would be best implemented as #2 above.
Note that APP source edits often require a developer to have a certain level of training or experience to be effective.
Gareth