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The devices run a custom linux OS, so no android exploits. You can use UMS to sideload, or FTP, or SSH. Like I said above, you can sideload all kinds of programs for the device; they aren't that draconian at stopping things from running. They are just careful about not letting you get root access (probably because some of the software on the device is commercially licensed and they have to make an effort to stop anyone from pirating it).
If the internal SD card can be removed, then it may be possible to insert an SUID program into the root filesystem and execute it via a terminal, but it's complicated because the root filesystem is compressed. I'm not sure how easy it is to access it in another system.
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