I have never dot and dabbed plasterboard with anything other than dry wall adhesive, the thing to remember is the dab of adhesive are peaked when put on with a trowel and the board is pushed back to the wall and is spread out on the rear of the board covering a lot of area but a 10mm gap must remain behind the board any thinner could weaken the adhesive for which it was designed for. Tile adhesive is normally a bed of about 3-6mm bed, so unless your using, say a thick bed adhesive, could the standard addy fail to excesive depth for which it was'nt designed for, just my humble opinion