Hi @anon1463932 ! I ran into a similar problem and found a workaround by simply creating a 2nd project where all the tasks get multi-homed automatically from the 1st project. You can then use the 2nd project to add another 50 rules! 
Note, you may likely need to add the same custom fields (or just the ones necessary) to your 2nd project in order to run the further automations you need, so make sure those custom fields are all added to your library so you can add them easily to your 2nd project.
Also, the 2nd project can be just private for you, while all your automations from both projects will work in the 1st project for everyone else!
Let me know if you run into any issues 
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