Well, I successfully used F2 mapper for most of the locations and I only needed to modify map headers to make them work in F1. I have problems only with those with some cave elements. Even moving F1 terrain protos didn't help.
I tried using Dims' mapper but it's unfinished - for example when I add new weapons to map, they get ammo without specified type which can't even be unloaded, also it tends to crash when I add new item pros to F1.
Also, it doesn't automatically update creatures, which makes adjusting HPs after changing pros a torture.