Hey JP,
the “sticky” feature in Ikebana works like the same feature classic blog layouts – the “sticky” projects are displayed in front of others; it is not possible to “stick” boxes at random places within the masonry grid, because the grid changes with the screen width of the viewing device (the Isotope plugin, which is the basis of the grid, does not support this feature as well). Please let me know if I misunderstood the question!
Sincerely,
Andrii / Satori Studio