I guess it depends on what kind of strap it is, because a wiimote type strap is entirely different than a knuckles strap. I basically can't play beatsaber on a quest because the "strap" is more of a tether and doesn't allow you to relax your hand during play without dropping the controller. Imo a knuckles style strap should just be standard on all VR controllers.
I also find toggle grip to be super unintuitive, nothing quite beats closing your hand to grab objects and opening your hand to drop them. Hopefully there's a way to use the knuckles with this headset, because otherwise I'm probably gonna stick to the index for a little longer. Ergonomics needs to be good for something I spend many hours using, and I really think the knuckles controllers knocked it out of the park
It sounds custom but similar to wine, since the website alludes to a compatibility layer (translation) for the Android version of the game. My guess is a completely custom android / java runtime that is built specifically for Roblox and translating the necessary android specific calls to Linux.