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In Figma you can copy all properties from an object, or you can copy them one at a time.
You can control how corners are rounded by using something known as “squircles”.
Much as you would in a word processing application, you can use shortcuts to toggle italic (CTRL or CMD) + i, underline (CTRL or CMD) + u, and bold (CTRL or CMD) + b when a text object is selected.
Instead of typing values in, you can scrub through values in a settings field by holding down ALT or OPTION (depending on your platform), then dragging left or right in that field.
You can refine the color picker values (or field) by hitting the up or down arrow keys. Nudge with larger increments by holding down SHIFT at the same time.