i think theres a dwarf form of Guelder Rose...Viburnum opulus...

Cotoneaster horizontalis is good because it gives late spring flowers , lots of berries , fantastic autumn colour and ,a feature often overlooked , puts its new leaves out very early in the growing season . am i the only one who has noticed how horribly skeletal and bare those Hibiscus look nearly all through spring?

oh and C horizontalis can of course cover vertical areas with little or no support needed.