Is there a way to account for other existing boosts?
When using plugins that boost gathering based on the skin the tool has, (ex: hatchet)  is it possible to make turbo gather boost on top of it?

For instance, if you have a 1.5x turbo gather and a 1.5x gather rate associated with a hatchet, can you make it 3x gather? I believe in this case, it only boosts 1.5x times as it doesn't understand the hatchet boost.
I believe the plugin will currently boost whatever item amount is given to it when the hook is called. So if your skins plugin has already modified the resource output, the plugin should then multiply that resource output again by whatever you have set it to. The only way I could think of (off the top of my head) to "add to the multiplication amount" would be to write in constant variables for how much resource would be gathered per hit, for each tool, which isn't really very time or resource effective.
In response to redBDGR ():
I believe the plugin will currently boost whatever item amount is given to it when the hook is calle...
Thanks for the response. I'll seek out the author of the skin plugin and see what happens.

I'm guessing the method you mentioned would work, checking skin id and tool, plus multiplier in a config, but that seems like a bunch of work and it sounds like the originating plugin might not be designed properly.

Thanks!