I'm so glad that I found a thread that's talking about this! I may be echoing what a lot of others have said, but this is my experience:

I work full time as a legal assistant, so I study for ~1-2 hours on weekdays & Sundays. I've had to take short breaks from studying when life just gets in the way (illness, weekend plans, long days of e-filing, etc.). I like having my lessons sync up with the current day, and I find it difficult and stressful when I have to catch up for lost time. I've tried adjusting the start date of my Study Plan so that it realigns with the current date, but I've found that when that happens, the lessons shift around in ways I don't expect (also, I can't always see old lessons that I've completed if I've shortened my schedule by an extra week). I'm committed to studying consistently, but it would be nice to adjust the Study Plan to account for a few days off here and there.

My suggestion would be to include a feature where you enter dates (in the future and past) that you're set on no studying. Then, the lessons within that week/two weeks get broken up accordingly so you can still keep your end date/test date. For example, if I were to go on vacation from May 1-5, I'd enter in those dates in the Study Plan, and the Plan would split up the lessons from those dates before and after my trip. Sure, that means a few more lessons on average for a bit, but it's a lot better than seeing 5 days of work to catch up on.