The bonus point system has always been a sourse of debate. The 5 batting points thing was brought in to improve the standard of pitches, in that if a club could see more benefit in producing good wickets than the situation we often saw in the 80's (Green pitches on which even average bowlers could get good figures). I think in theory that is a comendable idea,as the only way to produce good bowlers is to have them bowling on pitches they need to work hard on(!!!). I think in practise it hasnt quite worked out quite right, however, I guess it could be said that the results the current crop of England bowlers have produced in the last 2 years MAY suggest it has helped.
I dont think I have that much of a problem with the 100 over cut off,if its going to produce positive play,and therefore encourage a result (which on improving pitches, in 4 days , is going to be quite tough)..its certainly a better situation than how it was in the 70's, when the first innings were limited to 100overs,at which point the innings ended. The skill of innings building was really compromised by that
To be honest I wouldnt be against the idea of a straight 10 points for a win, 3 for a draw, and maybe a bonus for a first innings lead