The One-Action Combat System, I feel neutral about. I think I would have to try it out before I could make any sort of ruling on it. The one thing I do like about it is the, X number of spell points per encounter and 5X points per day. That is something that D&D could really use.
I'll talk this over with Nathan and see if we can't come up with something that would work for you. Using the conversion of spells as written with the normal round structure would undoubtedly weaken spellcasters too much.
Reintroducing caster level scaling to spells won't work, because it provides an incentive to memorize lots of low level spells rather than any high level spells.
Increasing the number of spell points per encounter might be the way to go.
Note that the 5x a day is somewhat arbitrary. We figured that if a party healer used his spells to get the party back up between fights that it would allow 2-3 delves before healing. The primary impact of changing the number of times per day is socioeconomic, as the spells become much more viable for doing things like building houses. In fact, characters from an Arcane society (like a race) in Summa can get their spells back 10x a day, precisely becuase we wanted those cultures to look like bizarro world.
A Mencken quote? Nice.
Let's talk about more fan support for 1-Action Combat? Some things that I'd really like to see (and that I might start working on in my spare time) include:
-The previously mentioned support for the Immortals Handbook/Grim Tales CR system.
-Support for Elements of Magic: Revised.
-New versions of the Speed Burst and Rapid Strike feats (possibly combined) from Monte Cook's Arcana Unearted and support for all the stuff from The Book of Iron Might.
I'd love to see the IH conversion. I use GT's calculator for my standard d20 games, and we are adopting something very similar for Summa.
As far as EOM goes, Nathan had already written a whole class based on the original for 1AC. When I bought the revised I said that I didn't think this new version needed much conversion. I'll look at it this afternoon between studying for my medieval philosophy midterm tomorrow; if it's as simple as I seem to remember thinking it was I'll post it tonight.
I don't have Iron Might, but I'll look into AU as well; it holds a special place in my heart, since I was the
first to buy a copy, heehee. That was my ultimate geek-out moment.
If people want to type these up formally, I'll talk to the publishers/authors of the texts in question and see if they would be cool with us posting a set of fan-created conversions for 1AC on the UPP website.
The link to the spells per encounter is broken on the Undead Presidents page.
We'll get that fixed today. You can get to it by clicking on the design diary link from February 8 on the front page.