Well, I started on this only recently so take this with slight reserve, but:

- logic is expressed thru *.simcraft files, not fixed internaly in simulator (well, at least in above example)
- for each step in simulation when player is able to cast anything, simulator check 'actions" one by one, in order they are stated in simcraft file. When he finds first one that is "available", he execute it
- "Available" action means that you have enough resources(mana) for it, that it is not on CD or already applied on target (if DoT)
- in addition to that, sometimes you want to use more restrictions. For example, you dont want to use drain_soul before execute, so you put additional condition ",health_percentage<=25". Without it, it would be used whole fight

As for possible options, there are two types: those available for any spell, and those specific for certain type of spell.

Among those available to all spells you have "rank", "seq","sync", "time>","time<", "time_to_die>","time_to_die<", "health_percentage>""health_percentage<","bloodlust". You can guess usage of most by name.

Those specific for spells are for example "interrupt=" and "debuff=" in above example, and each works specifically for its own spell. That doesnt mean that spell XYZ can not also have "debuff=" option, but it means it can mean or behave differently ;p

In this particular case, I *think* that debuff=1 restriction means "cast Haunt only if debuff is about to expire (or expired) on mob". In this example, that is different from just "/haunt" since second one means "use haunt as soon as available", which is right after 8sec CD. First one means "use it before 12sec debuff goes out". So you basically told simulator:

If haunt debuff is about to expire, cast haunt. otherwise cast Corr or CoA or UA (whichever is not on mob). If they are all already on mob, then cast normal haunt if its 8sec passed. If haunt is still on 8sec CD, cast Shadow Bolt , unless mob is under 25% in which case cast Drain Soul instead of SB. And other option "Interrupt=1" means "if any spell listed before Drain Soul in actions is ready, stop draining and check again actions in order".

In the decimation profiles listed in the OP, it comes before the dots. No dot has priority to casting the SF. Any dot is going to break your weaving however, so right after an incinerate might be the least disruptive.

For me it being 56/15 spec for my guilds 10 man group I find it easier to use a dot after soulfire so I will still have 1 decimation proc up because of the previous shadowbolt cast then go right back to 1:1 shadowbolt to soulfire. This is with shadow bolt now and not with bloodlust.My shadow bolt cast time is near 2 secs something like 2.04 with just the totem haste.

A question I have had is it better to do CoA during 35%>0% even if you know another doom will go off for better MC uptime? Also like some have said do you drop corruption in this time also or just weave it in for more MC uptime? I try to use the method above with each dot/lifetaps seems to work ok but I'm not sure if someone else has found that dropping them yields more dps.

Nvm was wrong