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Look the Forge's source code. In BedBlock, minecrafts uses PlayerEntity#displayClientMessage to display sleep result (which can be success or failure, so "You can only sleep at night"). Just give an ITextComponent (StringTextComponent or TranslationTextComponent in most cases) and set the second boolean to true to send an state text instead of sending it to the chat. So: PlayerEntity player = //Get player here player.displayClientMessage(new StringTextComponent(""), true); I havn't check that, but it should be somthing like that

you have to overwrite the DimensionType file (minecraft / data / dimension_type / the_nether.json) create a file with the exact name in this directory, take a look at these two links my dimension type for a new dimension and the minecraft wiki for dimensions (look at the vanilla defaults) https://github.com/Luis-st/Forge-1.16.5-Nero/blob/main/src/main/resources/data/nero/dimension_type/deepslate.json https://minecraft.fandom.com/wiki/Custom_dimension

This PR would have allowed you to control the movement speed while the item was in use, but the author hasn't responded for a while. If you were to update it, it may be merged for 1.12.1 and possibly 1.11.2.

Thanks for showing me the right direction.