Hey, thanks for feedback, most of these things seem like they could be added.
Not sure if the game can recieve wheel input or middle/right clicks on web, but the game is gonna be released on Steam soon and I'll add an option for something like that there.
For a hold-to-click option, you can use lightning to minimise the amount of clicks you can do. Not planning to add a simple hold-to-click option without any depth. Can add a hold option to the buy max button.