hello,
there is practice mode where you can enable only certain pieces. If
that is not enough and you know bit of programing, making randomizer
than output sequence you want is very trivial task. There is
Nullpomino mod that adds bunch of practice features:
http://harddrop.com/forums/index.php?showtopic=4022 , you may find
something for you in there.
about Z and S rotation in SRS i also find that confusing and always
press wrong rotation, but nullpomino focus on imitating existing
games' mechanics rather than inventing its own. You can try other
rules, for example CLASSIC3, that is far less confusing. But what is
good about SRS rules (Standard-*) is that many games use it, so you
don't need to relearn things when moving between games.
--
regards,
wojtek