In a way, you can do the same in Capture. If you select the fixture in the order you want to number them, you can (by holding down the SHIFT-key) and then choose option+command+A (for assigning a channel number, using a Mac), you'd have your channels numbered in the right order with more or less the same amount of mouseclicks as in Wyg. The only difference is the order in which you have to do this.
After this it is really easy to use the sort by channel column in the Fixtures tab to select the fixtures once more for assigning patch, unit numbers, etc.
Also in Wysiwyg, you can choose to assign spot numbers (increased by +1), patch (increased by the number of dmx addresses needed for a certain fixture), purpose (a text field entered for all fixtures you assign in one run), and many more things all at once. This is the feature that I sometimes miss.