The wikieditor is not bad but I prefer using the VisualEditor. Is it possible to use this extension in conjunction with it?
Topic on Extension talk:MsUpload
Not really, and there're no plans for it, for now.
@SophivorusSeems it would be unnecessary as the functionality is in Visual Editor already according to this ticket: https://phabricator.wikimedia.org/T39932
Though in reality the functionality is not working as intended so I have filed a ticket here: https://phabricator.wikimedia.org/T208631
If you or any other devs on the MsUpload project would have some insight on fixing this issue that would be much appreciated I'm sure. Though I'm pretty clueless on this stuff so maybe it's not something people care about on the visual editor etc
Modifying MsUpload to work with the Visual Editor would require huge changes. It seems to me that the best way forward would be to fix the Visual Editor bug. The first ticket you linked had an amazingly positive response, so don't lose hope on the second one just yet!