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HUBs work and you can connect more devices that way. But there seems to be hard limit in number of USB endpoints devices can have in total - 32 is maximum for all devices. See http://forum.mikrotik.com/t/two-lte-minipcie-modules-not-working-on-rbm33g-bug/120893/1 for more details. Simple devices like USB to RS232 converters usually just use three, but then some LTE modems just go crazy with 17 endpoints (wtf) and that’s causing problems..
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Raw USB access from containers is currently not supported. It might be in the future (was suggested to developers multiple times…) But you can put containers on USB flash disk/drive, that works as intended (mount it, then use the path when creating container).
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UPC support is limited. If yours works with “nut” on linux using APC protocol driver, it will probably work on ROS as well… otherwise no luck.
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Yeah, creating directories in internal storage is just real PITA for no reason. Just look around forum for various hacky ways to accomplish that. It’s ugly. It sucks.