One idea posted before was to sling resources by clicking icons next to resource-related taunts. Other ideas included just using text in chat to sling resources (e.g., “@4 500g”), or give the ability to sling via the resource icons at the top of the screen, or enhance the Market’s menu to allow hotkeys, etc. Here’s the discussion, if curious to see:
I’m hoping for a dev-implemented solution rather than a mod, personally.