A lot of interesting stuff...just a few thoughts:
Eliminate the 'jump putt' - because ANY rule that can't easily be determined (if it's been violated or not) is NOT a good rule. Remember, we're talking about people here!
As Chuck stated previously, maybe eliminate the mini alltogether. Your lie is the back-most point of your previously thrown disc (in relationship to a straight line to the basket...or where the group assesses the basket to be). The heck with any mando or intended flight path worries. Keep it simple! We ALL have to play by the same rules so they don't favor anyone.
If you want to use that same disc again, put another disc down in its place. We have to believe there are SOME ethics in disc golf / disc golfers - so I'm not worried about someone placing the newly placed disc slightly askew to benefit themselves (that can be done presently anyway if you think about it..).
Keep the line-of-play aspect there though. As K (I think) stated, it's relatively easy to see if they keep a contact point on the LOP but much harder if they're off "just a wee" on some 'box' in back of the lie.
Or find a way to write in the rules that you have to HAVE contact with your mini / disc upon throwing your next shot!
Half-kiddingly I say "Stand and deliver...or stomp your mini into the ground"!
But half-not-kiddingly I say "Why not (these)?" Think about this before you dismiss it; there IS merit!
Ps: And "thanks" to the board for opening up discussion / working toward betterment on such rules.