QtCreator: number of recent projects
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No, this is not configurable and since the welcome screen is a bit static it will most likely not work well if you increase the number (the plugin is located in src/plugins/welcome if you want to try anyway).
You pass the project or session to start to creator via the command line though. I use this to have my most often used projects in my start menu. Not really dynamic, but my projects do not change that often;-)