Re: smuggler gets to be a spider, yeah, that is probably a good idea. My original beacon item called TS to the station, but there was no guarantee you'd end up as one of the TS, and they had no loyalty to you. Thus... you might get killed by your own creations. Good for a hijack item. Not really good for a game mode item, due to bad incentives.
Re: making both TS and blob use level 5 biohazard, I'm against this. Aside from the fact I think the current level 3 alert is cool, I also think that if we're going to merge 3 and 5, there's really no reason not to merge all biohazards into one generic 'biohazard' alert. Everyone ignores level 7s anyway. Personally, I think its cool that we have different levels of hazard.
Re: knowledge that there are no other threats... I could add a new, yellow spider, that infests corpses and uses them to sabotage the station, bursting out and back into spider form after a couple of minutes. Alternatively, I could add a queen ability that doses a crew member with strong hallucinogens that make them friendly to spiders for a limited time. Both of these abilities would require very strong limitations, in order to prevent a single person releasing the tesla, or whatnot. Not decided yet. Still at the idea stage on these.