@swmeek
This would be controlled by the CraftingQueue. In default gaming Config/XUi/windows.xml and regular things use windowCraftingQueue
The stoves are using the default setup in Vanilla hence nothing jumped out. It is possible to create a custom version to increase the slots. Needs a few things hooking up though.
Something like Khaine's 12 slot crafting queue may point you in the right direction.
And something a community asked for:
This was for the XUi/xui.xml
<xui>
<append xpath="/xui/ruleset">
<window_group name="workstation_cementMixerInsane" controller="XUiC_WorkstationWindowGroup" open_backpack_on_open="true" close_compass_on_open="true">
<window name="windowCraftingList"/>
<window name="craftingInfoPanel"/>
<window name="windowCraftingQueueInsane"/>
<window name="windowOutput" />
<window name="windowNonPagingHeader" />
</window_group>
</append>
</xui>
And the hooked up changes to the crafting queue in the windows.xml of the same folder.
<configs>
<append xpath="/windows">
<!-- Extra Crafting and Queue Slot and row -->
<window name="windowCraftingQueueInsane" width="397" height="78" panel="Left" cursor_area="true" >
<rect depth="0" pos="19,0" width="378" controller="CraftingQueue">
<grid name="queue" rows="2" cols="5" pos="3,3" cell_width="75" cell_height="75" repeat_content="true">
<recipe_stack name="0"/>
</grid>
</rect>
</window>
</append>
</configs>
Your window group would be something like workstation_StoneStove as they are hooked up with hardcoding that way. And the windowCraftingQueueInsane could change to windowCraftingQueueStoneStove and hook up in both.