My guess is that LibreOffice won't be supporting Hyperlink datatypes anytime before HSQLDB does; so you should direct your appeals (and rants) to them.
In the meantime it's relatively easy to implement hyperlinks as character field types along with a push button + a small macro to open the link on a form.
OR find a Database that does support hyperlinks AND has a driver that can be used by LIbreOffice.
[Rant warning!]
IMHO (having spent the last six months porting a large & complex MS-Access to LO-Base) the developers of LO would be much more effectively employed making BASE stable, fixing the outstanding bugs and making the macro language: comprehensive, consistent and transparent. Compared with VBA there are large parts of it that are positively opaque! (That last remark does not apply to the excellent Access2Base package however)
[End of rant]
Found a very easy to modify Macro that allows you to open any file type from a push button on a form for all those ranters. Let me know and I will post it to keep you guys happy works like a charm.