It's good in theory, but makes it so much easier for bots = Nope from me :P
Do you honestly believe someone would go through the effort of making a bot just to actively play this game? And even if they did, do you really think they'd use it in group content with other players watching?
If anything, a bot would be used solo - and most likely for transmuting, not for killing mobs. So I'm pretty confident mapping 1-9 to the grid wouldn't suddenly create a botting wave.

Also, let's be real - the game itself is simple enough that if someone really wanted to bot it, they wouldn't need numpad shortcuts to do so.
So why should we limit potential QoL features just because of a hypothetical scenario?
If we dislike bots that much, are we really going to let the mere idea of them stop us from improving the game?
Do we want to act like bots already won - even when they're not even a real issue?
