I think this will do what you've requested.

/use [nomodifier] Crippling Poisons II; [modifier:shift] Wound Poison V;
/use [button:1] 16; [button:2] 17

This will apply the poison to your MH with a left click and to your OH with a right click. Modify the click with shift / alt / ctrl as you wish to add new poisons.

You can add additional poisons by just adding another modifier, also you can do combo modifiers if you wanted all your poisons.

Shift=Wound Poison
No modifier=Crippling Poison II?

/use [nomodifier] Crippling Poison II; [modifier:shift] Wound Poison V;
/use [button:1] 16; [button:2] 17

get this updated version, I had an S on crippling poison that might have slipped by you. I'm trying to figure out the script to just have a one button left click for crippling and right click for wound, but I've forgotten the script.

In the mean time just use a left click to apply crippling poisons with this macro, and a shift + left click to apply wound.

I'll see if I can find a more fitting macro this afternoon.

The macro doesn't work. I get the response on my ui that the commands modifier and nomodifier don't exist. It's fine though clicking my poisons won't kill me.

I'll try to take a look at it tonight or tomorrow at the latest. Been working to get the new zuggaming layout hammered out..so it's been taking up a lot of my time recently.

Soon as it's up I'll be pouring a lot of new content onto the site.