In tower defence, to send some troops you have to right click the chest, select de troop quantity and click the send item. That may be cool when you want to send 12 giants, but when you just send zombies or spiders could be a little bit heavy.
So, to solver that I suggest to Make a Fast-Send function that makes you able to send troops just shift+right-click the chest and sends the last troop horde that you sent. Another option could be that with the shift+right-click, you send the troops that you have in the chest, for example, you hae 5 spiders, and 5 zombies selected, so with shift+right-click you send that troops all the time unless you change them in the chest.
So, to solver that I suggest to Make a Fast-Send function that makes you able to send troops just shift+right-click the chest and sends the last troop horde that you sent. Another option could be that with the shift+right-click, you send the troops that you have in the chest, for example, you hae 5 spiders, and 5 zombies selected, so with shift+right-click you send that troops all the time unless you change them in the chest.