We never specify any release dates because we rather finish something than release an unfinished product at a set time. I'm not sure when this will be added but I think this will be part of the usual update cycle and not a new app. Most of the code to load up these options is already in the mobile version as we speak. Just the menu needs some final touches and we of course need to create more engine models that we can swap, etc.
That sounds fantastic... knowing that we're close to something that opens up doors to much bigger things is always exciting 😁