I just got to my 35 day streak and I missed one day because I had to perform in a concert and was AFK for 10 hours straight. I think adding streak Freezes would be a great idea even if you renamed it to "streak saver" or "streak keeper".
You could make it so you earn one for every 10 days you keep your streak, or for every 10 levels you go up.
An alternative might be to give out a streak freeze every 100 days of streak (every time the streak reaches a multiple of 100 days), or to hand them out at random like spotlight awards.
Your life doesn‘t depend on your JetPunk streak. If you miss it, you miss it. That‘s it.
Adding a streak freeze would just overcomplicate this cute small feature. I just don‘t think this is necessary.
I have yet to lose my current streak and want to keep it going for as long as I can, but sometimes I just feel like it's only a matter of time before I eventually lose it (and feel terrible about it).
The thing is, the longer your streak is, the worse you'll feel after losing it. Not everyone can attain a spiritual state that's advanced enough to suppress all bad feelings of losing a streak.
If your goal is to get the streak as high as possible, and you know the risk of potentially forgetting about it, you shouldn't feel sad when you forget about it. That's your own doing. A streak isn't the meaning of life. If you don't do your daily work to upkeep the streak, then you don't deserve to keep the streak. I think the option for a few, finite freezes could be okay. But JetPunk isn't the end all be all.