An initial condition for a vsource or isource is rather meaningless - it's implicitly defined by the source itself.
For capacitors and inductors you can specify an initial voltage or or current (see "spectre -h capacitor" or "spectre -h inductor" and look at the ic parameter). Alternatively you can use spectre's nodeset or ic statement (spectre -h nodeset or spectre -h ic) to do this kind of thing on particular nodes (say).
As for the bit type stimulus, you can do that:
Code://
vsource (1 0) vsource type=bit val0=0 val1=1 rise=1n fall=1n period=10n data="101100101"
r1 (1 0) resistor r=1k
tran tran stop=150n
Best Regards,
Andrew.