Hi, Welcome to the Forum nix !
Here are all important links:
http://lmms.io/forum/viewtopic.php?f=1&t=4740
-A few rules and useful forum instructions
Yes, a beat-library could be nice! Why not create one, and share it with the community?
Currently, development is focused on stability and features, but a library in mmp-format, that is something every community member can make, so here YOU can participate in the project :)
Currently, there is no plans for a beat-library, from our side. No time for that.