[@Oraculum] It's definitely possible for anyone with the power or finesse to bypass Teknall's barriers around it, or anyone who gets their hands on one of Vowzra's artefacts, which are scarce but scattered willy-nilly across the universe. If they also have sufficient knowledge and patience (and damage control), they can even extract useful tissue from the Gap. Osveril is in a pretty good position to learn how. 

Jvan doesn't control the barriers around the Gap but she keeps a very close eye on them via Ovaedis. She's touchy about it because of the risk, and how much she's sacrificed to gain what control she has, but much like the drugs she dealt when she was a teenager, she's all for responsible use. So long as she can continue to keep Galbar relatively safe she'll support whatever she finds interesting. 

People lose out by not asking her for free gibs. She's a very charitable god.