With paint.net, Gimp or any other software to edit textures have keyboard shortcuts like P for the pencil with paint.net. And it will be nice to have few shortcuts for the texture editor too.
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.