add thought type, link type, color to many thoughts at once
It would be very helpful, especially when adding lots of new thoughts, to be able to highlight multiple thoughts, and automatically add characteristics (thought type, link type, color, etc.) to all at the same time. If this capability exists, I sure can't find it.

Hold down the control key and click the thoughts to select them. You can also select by control-clicking a gate, using search, using a report, or using the crawl function. Once you have a selection, right-click to set the thought type.
Currently you can’t set link type or color this way – if you’d like to be able to do that, vote for this. :)
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ChanurCousin commented
Adding LINK TYPE to multiple links in the same way it is done for THOUGHT TYPE would indeed be increasingly useful to the way I enter some categories of thoughts. Doing the same for COLOR may also be useful to others, although my own brains link color to Thought Type and to Link Type.