Our users a clamouring for IMAP keywords support (user-definable permanent flags, a.k.a. "PERMANENTFLAGS \*") which is necessary for shared user-definable tags in Thunderbird, among other things. WinGate 8.3 doesn't seem to have that feature.
Do newer WinGate versions (i.e. 8.5.9 or 9.0) have it? If not, is it perhaps planned for the nearish future - say, over the course of this year? If not, is it possible to add user-definable permanent flags via the WinGate SDK?