tbh I wasn't sure either. however the latest config changes were made in an effort to make the Horizons and Monster Changelogs the same. So I believe garden was disabled in horizons and we changed it to be the same in monster. As for why it was disabled in horizons, well im not sure.
EDIT: I just asked Eyamaz why and he said it was mainly because the biome was out of place. You can re-enable it and there is no bugs
That's the one weird config change you noted?
"GeoStrata - Enabled the generation of Rock" - great - now we have a whole lot of stuff we need to tunnel through thats like cobble - but requires a iron pickaxe. Oh - and limestone, quarried stone, sandstone and quartz variants added by other mods have not been disabled. Its like the forge "oreCopper" wars all over again, which only just have been resolved. Also, is this rock properly minable at full speed with ic2, tc4, TiC's mining tools?
"Tinkers Construct - Keep Levels on death" - er - ok. nice i guess. But reverted again in 1.0.7
"Tinkers Construct - Bronze ingot return from 4 to 3" - Where did that other ingot go exactly? At least this too is reverted in 1.0.7