Please note that this question is not related to Admin Tools. You can actually search that information in Google, like I did, and find out that
it's possible (with instructions). If you are using Admin Tools' .htaccess Maker you can insert these directives in the "Custom .htaccess rules at the top of the file" area.
Regarding a list of crawlers and bots, I would not recommend using any such list you will find on the web for two reasons:
1. They become outdated faster than you can type them; and
2. Adding hundreds of extra lines in your .htaccess file will have a measurable performance impact on your site
I would recommend using the Project Honeypot integration instead. It's built into Admin Tools Pro. All you need to do is get a free Project Honeypot key and you're set :)
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!