The E latch is open on the picture, its a b-ext. i was playing it and my phone rang so since i was holding bass i leaned it forward and took the pic with my phone. my latches are also adjustable along the extension, they are the ones from basscapos.com which to me look almost exacly like the ones from the american (non-original) stop makers. and the leather on them makes a way better sound than fingered, but i think thats just the bass as it(the bass)was able to play an A with a loosened E string. as far as opening and closing on the fly i usually plan out what stops i'll need and when i forget they aren't a problem to use either my finger or thumb to open. the tension can be adjusted on them as well in case i change to strings of a different tension, i like the ebony stop too but the capos are more flush and i dont have to worry about them sticking out off the side of scroll.the hat pegs arent a problem but i did find on the beeth 5 Allegro (pg 56 if u have the O. Zimmerman complete parts book thats yellow) a slight angle if standing is helpful or sitting works best. its not needed but helps. or fingering 2(E)4(F)2(E)1(D)0(C) works to avoid grazing the hat peg. its original so its not coming off,lol.
I've checked out/played the other materials used for capos especially the ones from Robertsons, and the KC Strings (even the Lamarrio) ones and these add far less weight and dont tilt the bass over (i will mention they are great and should be matched to the players physical capabilities and instrument) . I saved way more money than is posted on most installers websites by getting fingered ext and then deciding to add capos, but according to basscapos.com, alot of widely known shops and installers use them.
http://www.basscapos.com/installers.html