MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.
To spawn multiple gems, just use for loop to spawn multiple.
For the second request, there is another similar ticket with player inventory management already open and this is planned for the future :)