I like the option to filter by modules I own vs. all modules on this planet. Unfortunately, if you own any module multiple times, this is not reflected. That´s why I built an "inventory system", ie a rack that holds the exact numbers of things I own. Building a new system from this inventory is not very smooth, picking from a list works much better.
Same things goes for "modules I´m interested in". If one was able to have another list on the "all modules/my modules" level, this would be very convenient to pick from while building or editing a system.
TLDR: Can we have customs lists besides "all modules" and "my modules". Doesn´t have to be an unlimited number, but, say, 5 would be awesome.