Allow custom modes

[xeruf]

I have two different modes I work on my computer:

• Usually, I want to have a rest break every 40 minutes and a micro-break every 15 minutes with rather invasive nags (rest postpone time 5 mins and micro postpone time 4 mins). This is my default "work" mode.
• Sometimes, I want to merely have a micro-break every 15 minutes, nagging me after 5 minutes if I don't take it. This is because I will take longer rest breaks at irregular times and don't wanna be interrupted for extended times. This could be called "focus" mode.

For the latter, I used to simply turn workrave off, but then I always realize afterwards that I didn't take any breaks at all, which means I often derail with nothing that reminds me to stay on track. So currently I change all these things back and forth. It would be nice if I could add a custom mode somehow, I don't mind if that could not be done from the GUI either.

[Chealer]

I am not against this request, but it is not so clear which issue this addresses. Workrave allows you to skip rest breaks, so when you are in ‘"focus" mode’ and plan to take a longer break later, you can simply skip the rest break recommendation.