Username and password autofill is great, but it breaks on sites (such as for certain security appliances) where the password and OTP have to be entered into the same field. Obviously the work around for this is to not use autofill, but it's only an issue in this particular case. Some options for an improvement might be:
A per-entry whitelist that works like a boolean of "copy both password and otp for this site" consisting of the password and otp concatenated together in the clipboard, with option of Password+OTP or OTP+Password, for some schemes where the OTP is required before or after the password proper,
A right-click option under "Copy OTP" that allows for "Copy Password+OTP" and/or "Copy OTP+Password", for some schemes where the OTP is required before or after the password proper, or
Both of these.
I hadn't seen such an option in the desktop client for this, so either I missed it, or it's not there. Either way, great application!