Uhm the item you suggest only improves mark I reactors, actually..
and mark I reactors have a low efficiency for a reason, they are 100% safe, going for the risk vs reward thingy.
common sense says no to breaking that rule, i suppose.
edit: appears i failed to read the "while it's in use"
in that case it seems a bit misplaced, as not the uranium cell seems to generate the EU, but the fission rod.
Scaffold didin't help ?
as of now, there is no way to place scaffolds around cables, and that was my main concern.
and i really like the concept of scaffolding places to do the walls, this is why i suggest a lower efficiency with smaller brushes.
maybe they should allow compressed CF to be placed on wires while making dried CF breakable so it drops an item and you can place that on wires as well
I guess that would kinda ruind the fun waiting-for-that-shit-to-dry part.
especially since it doesn't dry once it's closed within solid blocks takes building with the actall foam to a whole new (industrial :)) level!
I said this, while building a Tunnel of CF, and all the CF was all of a sudden spread into my Face (before that, it just sprayed fine and flat into the walls), due to a Bukkitbug with CF (I wasnt able to reproduce that on my nonbukkit local Server). I would like to have a Low-CF-Mode and a Single-CF-Mode for the Sprayer to simplify it a bit, instead of using Scaffolds.
well, i kinda like it a bit more challenging, actually, but the cable thingy is just unavoidable as it is 
but don't get me wrong, i would very apreciate yet more spraying modes, it does feel a bit odd for a recipe consisting of 4 cobble and a stick, tough.
Chears
having build my first base out of CF, i have come across some serious issues regarding cable covering.
Once one has a finished floor, any cable cannot be fixed without creating a huge mess.
for Holes created otherwise, i was able to use the pre-compressed CF block, but as they are actual blocks, i wasn't able to playce them inside cables.
This being a big nuissance, and CF being pretty balanced out by the drying time (and the light level it needs to do so)
i would suggest to add a feature that prevents such a mess.
The only two i could think of were to either to make cables act like scaffolds, what could, again, cause some unintentional cable covering cascade,
or adding a secondary Spay mode (CTRL + M) that only sprays one block at a time, at the cost of efficiency.
PS: i noticed my CFPack was halve full when i crafted it, i just checked the 15 suggestion pages already, i'd apreciate if anyone was to confirm this a known bug? [ it seems to be! 
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