When we are on a transfert menu, as long the possibility to transfert all the 'items' (ie all alien material) by just clicking on the item name, you may be interested in this little mod that allow to transfert 10 items with just one click.
It's not enough good quality to be one day in the trunk version but you may use the attached file to replace ufoai/base/ufos/ui/transfert.ufo (in fact rename you original version to revert the change). This file is loaded at game start so restart the game.
it will add a button that selects 10 items by 10 items for transfert.
Internaly it's done by calling 10 times the ±1 procedure. So you can't use that to cheat on cargo count.
there is still a little bug regarding having grey/blue button when reaching the max value. I still looking at a way to fix that...
hope it will help.