I only use open G for banjo (and Bandola) but I dont attempt to do fancy picking-- Just a sort of melodic thing round the melody line on the basic chord run. At sessions I tend to leave the capo on fret two as that makes G in F shapes and D in C shapes, which fits in with most tunes.A is of course open but Amin is a bit of a SOD.Unless you
are playing a particular Aranged thing, work on C and F shapes as well as open tunings, then adjust with the capo.If you dont have a fifth string capo PM me for me FREE 5th string capo design.