Advice on Efficient and Accurate E2R module

I was hoping someone could advise me on writing a "improved" E2R module:

Right now I see 2 ways of triggering a discrete time block:

1)      Use an analog event (the way the built in E2R work)

//discretize V(Ain) triggered by absdelta function
always @(absdelta(V(Ain), vdelta, ttol, vtol))
Dreg = V(Ain);

2)      Use a sample based system (the way I like to write it)

initial forever begin
Dreg = V(Ain);
#(tsample*1.0e9);
end

The problem with (1) and the default absdelta is that it assumes a level of accuracy. For a wreal, it could be 1million or 1 nano depending on what you are modeling!

The problem with (2) is with the sample based system I have to assume some kind of sample time which I suspect hurts performance if the sample time is much higher than the analog is taking steps (like if I have a DC signal and I am running for 1000 seconds with a hard coded sample time of 1ns).

What I really want is to just cause the verilog block to execute if an analog timestep occurs? I didn’t play with the absdelta function, maybe if I just set everything to 0 this does the trick?