Thanks for the replay,
Still, i'm not sure why Compression Mode option is only enabled for BC6H and BC7, when it was available for all compressed formats before this plugin was updated to support DX 11 formats. I have been working with DDS files from some time now and it was great that i could choose the compression for DXT1, specially because some of the textures had some detailed gradients and the default compression mode would mess those up very badly.
Then again, if it isn't possible to enable it again for BC1/DXT1 i'll understand.