Nathkira, wont happen with the 19mm tanks because there is no room for a hole as the interior/exterior orings are actually stacked and overlapping each other. The larger caps there is a good possibility it will be an option but probably not very soon because of so many other things we are working on.
even the chance of a possibility makes me happy =)
if you want someone to beta test a prototype .. count me as a volunteer =)