Although it's kind of under the umbrella of "Support for your other Windows application passwords" what I would really, really love is a Windows version of the LastPass application for macOS. The Quick search functionality of that app is beautiful, elegant, and very fast. The original Windows LastPass desktop application was comprehensive, like the Mac version, but very old and was sluggish when looking up passwords. The new UWP Windows desktop app is better in that it's faster, but like many UWP apps, it's stripped down to bare essentials. There is no Quick search, automatic locking maxes out at one hour rather than 8 or 24, and there are far fewer features compared to the Mac app.
Why am I the only one asking for this? Since I constantly use both Windows and Mac, I'm very familiar with your applications on both. A Windows user would never know what they're missing in the Mac app. A Mac user would never know how much better their app is (although they'd likely assume as much, hah.) If your Windows users were aware of what the Mac users have, they'd want it, too!