Currently clicking anywhere within the bounds of a token will select it, regardless of whether or not that part of the Token has a visible pixel or not. This can make interacting with layered tokens rather difficult and cumbersome, and limits how Creators make maps and modules. You can't make maps with too many tokens intended to be switched between the GM and Map layer, because they would overlap and make things too difficult for the GM to manage. If it were possible to "select through" a fully transparent portion of a token to select the tokens below it, it would greatly improve the GM's token management.