not necessarily, many options are do able by changing components.

Some Options, : from Sturmey Archer their S3x, with a screw on freewheel.. ,
is a different set of gear ratios, .63, .75. and 1
than an AW3, .75, 1, and 1.33.. its freewheel mech part of the hub , though both have 3 internal gears ..

a normal as high, and 2 reduction gears, versus normal 1:1 in the middle
and a reduction gear , 1st, and an overdrive gear as 3rd..

what those 3 gears are is determined by wheel size, cog and chainring sizes.
http://sheldonbrown.com/gears/internal.html

What brands are at your local bike shops? is the Linus sold there?
If so, they can change things , that are not included in the original parts.

Know: You cannot test ride any Bikes Direct bikes,
and you have to put them together on your own.