Titebond has a slow-cure version (Titebond II maybe?) that stays wet a lot longer than the more yellow version. I apply it with a stiff-bristle flat brush, maybe 1/4 inch wide. This allows very rapid placement and spreading of the glue, dipping into a puddle of glue on a small piece of wax paper or a small container. I have applied molded LE shells on 3 60-size models this way with no problem, plus rib caps and TE sheeting. Tape the ends of the wax paper to the table so it doesn't life when dabbing the brush into the glue puddle. Poking holes in the finished stab is probably a good idea for the reason stated. Full scale fabric aircraft have vents in the corners of rib bays (lower side) for ventilation so why not us?