Re: Provide only certain selected plugins to member blogs?
Would there be a way to make plugin settings show up somewhere on member pages?
Yes, you can create a WP plugin with a settings page, then place that plugin in /wp-content/mu-plugins/ so it shows up on all WPMU blogs in the admin area.
EDIT: after re-reading this, you probably meant as a BuddyPress member settings page right? If so, don’t read the rest of this post!
Read up on how to create a settings page or use a WP plugin framework such as the one created by scribu:
https://wordpress.org/extend/plugins/scb-framework/
For how to use options in the front end, you would use the get_option() function:
https://codex.wordpress.org/Function_Reference/get_option
That should get you started.