On argument maps, here is a feature I'd like to recommend. It would be great to have an inference objection function. Right now you can only form an objection to claims. But you can't easily form an objection to inferences. For example, take a simple argument: "All that glitters is gold. This watch is gold. So, this watch glitters." You can object to the premises of the argument in mindmup. But you can't object to the inference from the premises to the conclusion. Yet this is a common style of objection to arguments. So, it would be very helpful to have this function.
You could do this by adding objections to the lines between claims and conclusions. So, on the above argument, you could have an objection directly attached to the line between "all that glitters is gold. This watch is gold" to the conclusion "This watch glitters." This would make it clear that the objection is to the inference, not the claims.