When The fight starts, the 5 battle options are presented and are binded to keys from 1 to 5. While in Battle mode all of the previous 1-10 binds are inactive. That turns out to be not only confusing, but also incredibly frustrating, and deadly. One would want to quickly toggle swimming, or be able to shoot arrows while in battle. Simplest solution would be to make the battle binds to sth. like alt+1-5, and clickable, because now they are not clickable and that's also confusing. The best solution though would be to copy the fighting system from legacy haven, where you could bind actions to keys in ender client, and could choose between few tabs of binds.
Thanks for your time, hope that that will get tweaked.