Is there a way to make a token behaves like: {p.@page#/of@} where “of” is the total number of pages for the current layout,
wich would appears like p.1/3, p.2/3 etc… ?
Not yet. You’d have to fake it (by knowing how many pages there actually are in the layout and entering that number as regular text).
It’s been asked for before and it’s on the developers’ to-do list.
Nice!
Sorry about the re-ask, but even with alternative searches options (that Daniel and you suggested…), this forum is horrible when it comes to find specific info. And I swear I’m scroll searching before I ask! 
I’m waiting (patiently) for flowtotalpages and scoretotalpages.