I made an account just to say thank you, Kelly (even though it’s a while ago that you wrote). I really wish InDesign had the same feature as Illustrator, as a matter of fact they should be merged into one application in my opinion, but for now that trick you told about is really neat.
If someone doesn’t understand the explanation, like Kiley, here’s a step-by-step guide:
1) Go to the stroke panel
2) Open the flyout menu (upper right corner) and select “Stroke Styles…”
3) Press new
4) In the window that opens, under “Type” select “Stripe”
5) Now, in the graphical representation of the stroke in the middle you get a vertical ruler with 4 pointers that you can pull along the ruler. There might be more, depending on how many stripes the stroke has. Either way, pull them all into the middle, so they meet/cross over each other, and they will merge together into one stripe. You are now left with only 2 pointers.
6) If you e.g. put those 2 pointers on 25% and 75% the stripe will cover half of the available area, and this will mean that the stroke will be half as wide as normal. You can adjust this into what fits your needs.
7) Give your new stroke style a name. I will recommend naming it James.
8) Press OK and again OK in the other window, select your already created stroke or make a new one, and then in the stroke panel, under type, your new stroke style, James will appear in the bottom. Select him, and the stroke end/start you specify will be twice as big as the stroke weight (if you followed my 25% + 74% example).
Writing this was sort of a procrastination from working on the project, for which I needed this trick, so I really hope that it at least helped someone.