I gave up DVD video several years ago, but if someone would ask me for this old format, I would use DVDStyler, which is free, cross-platform and Open Source, and can burn discs directly. The only drawback – the last time I installed it on Windows – was avoiding crapware with the Windows installer.
Most provided menu backgrounds, buttons and graphic gadgets are clumsy or outdated, but you can use graphics of your own instead.
To me, disc burning is not a priority for Shotcut. Though I’m an old-timer and I still use a lot of blu-ray and some data DVD myself, I think that optical media are dramatically declining. My children (who are in their forties;) are no longer able to burn CDs, DVDs or blu-ray properly: they use HDs or USB keys.