It is on my todo list to improve this. At the moment, only the steemconnect auth token is used to identify a user. I'm planing to implement a encryption of a string using the posting key as second way to identify a user.
You can read more about the API here:
https://steempeak.com/utopian-io/@holger80/steemrewarding-com-new-api-functions-and-pause-votes-when-below-a-global-vp-threshold-have-been-added
My ideal voting tool will be mix of something like steemrewarding and wise.vote. Ability to make complex rules, text file config with rules, self hosted, web ui optional.
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
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