@bsansone Thanks for the PR - I believe this is already possible if you set the backgroundColor to transparent and then add the color + radius on the drawer element like this:

// in config
{
 left: {
 backgroundColor: 'transparent'
 }
}

<!-- in template -->
<MultiDrawer>
 <StackLayout slot="left" class="drawer">
 <!-- ... -->
 </StackLayout>
</MultiDrawer>

/* in css */
.drawer {
 background: 'white';
 border-top-right-radius: 50;
 border-bottom-right-radius: 50;
}

This feels more flexible than the proposed change - does the above work for your use-case?

@rigor789 Thank you, your solution works just fine. I didn't think of using transparent like that. I'll close this PR.