Falcon, your KR8 is a disposable cartomizer model. a cartomizer is an atomizer and cart combined. Also called a two piece unit.
As I stated, yes you can drip with or without the filler material on the 510 manual. Be very carefull though if you are using the auto switched batteries. With these if you drip too much, it can seep into the battery and short out the switch. The manual switched batteries are sealed so this seepage cannot occur.
No, you cannot drip with a KR8 because the cartridge and atomizer are one in the same.
You say you are using a passthrough. I don't recommend trying to use a USB passthrough connected directly to your computer, the atomizer pulls too much amperage for the average USB 2.0 port and may cause a circuit overload on your computer. Instead try using a seperate USB 2.0 hub that has it's on power supply. You can also get USB to 12 volt adaptors for use in the car and also 120 volt wall adaptors for USB passthroughs. Just check the amp ratings on them and make sure they can handle at least 2 amps or better.
Sorry If I sounded too technical. E-cigarettes are very different from conventional cigarettes. They require a learning curve for all users. Just keep with it and you will get the hang of it soon enough.
The lingo we use is also something to learn.
Here is a link to some of the abbreviations to help you to better understand.
Forum Abbreviations