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Gnome-Pie
Discontinued A pie menu launcher for linux. Read the release announcement of version 0.7.2 at https://schneegans.github.io/news/2018/10/30/gnome-pie-072 Or have a look at the homepage!
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The only mouse gestures utility I would use for something like this would be Fly Pie , as it allows for complex gestures with visual indication of what you're actually doing. But it's only for Gnome, sadly.
You want confirmation for your command, which I find only natural. It is unfortunate KDE's own mouse gestures are not more developed. There are Easystroke for X11 and Gnomie-Pie from the same dev you mentioned. The latter I never used myself, but someone implied it is cross-DE, ironically.