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While I would in general be very glad to contribute new features for the Vanilla community, I am rather short-handed at the moment and also do not have time to set things up so I can test my changes.
If anyone would like to make the changes (should not be difficult, it's some basic JS) and either submit a pull request or submit it on Vanilla as a new plugin which he/she will maintain, I am completely fine with it.
I'm sorry that I can't give a better answer.
Hi, terrible plugin author here.
I'm sorry, I no longer use vanilla and do not get notifications from the forum...
I've fixed a few old issues including this one and I hope the plugin is usable now.
Please let me know if the new releases help with the issues.
I have attempted to fix the error messages you receive with https://github.com/swook/Mediator/commit/0e00d16dceb6931990168f53ab5a26051e2988c3
A new version has been uploaded with the fix.
Please do let me know if the odd delay issue is still there. At the moment I have no idea why it would do that.