"briefly" usually means "about half" when it comes to durations. Most buffs in EB1 last 10 turns, so briefly would be 5. If you want to keep everyone buffed with a support cut, then yeah, you'll need to be doing it 4 turns out every 5.
There's no built in way to have multiple games... but oddly enough, due to some other changes I made recently to save/loading, this might not be as difficult to implement as it would have been before. That isn't something I should do for an experimental build, but once we're done here it's perfectly valid. For now, the only way is renaming/moving the folders around, unfortunately.
Re: Upping healing, yeah, it's my least favorite idea for a reason. I'm pretty sure it addresses the (potential) issue, but I'm also pretty sure it will cause some new problems, which may not prove any easier to solve than the (potential) problem it might fix.
Having relic preservation for demons wouldn't affect summoner battle length necessarily: they get unsummoned for free, but they stay at 1 HP. The penalty I had in mind for the demon version would probably be quite severe: I've even considered as much as 2/3rds of the demon's base MaxHP, effectively taking it out of active combat for most of a floor probably. I don't know if I'd actually end up going that far, but it gives you some idea where my head was at on that.
Consume/Recycle would probably need to change, yeah.. but they need to anyways, as do many other upgrades. That's probably more than I want to bundle into this experiment though.
Re: Emit Sparks: yeah, it's definitely going to be nasty if you're weak to Elec. At least they can't choose to hit you with it directly like with Storm Strike, but you can certainly get unlucky with it. ::mutter:: Maybe my math was right the first time and I shouldn't have touched them...
Re: oneyedjoe ah, the relic preservation mechanic seemed to feel at least close to right when I was trying it out: I was more worried about the changes to demon survivability than the summoners, at this point. It does seem like there's cause for concern there, but going to wait on a bit more data. I have some other knobs I can turn before I have to do anything too drastic.