Sword triggers were continuous in 2.10, but they aren't in 2.50.0. I don't know when exactly it changed. Shouldn't be hard to figure it out, I just can't check the logs right now.
In LinkClass::check_slash_block(), comment out the lines
Code:
if(!isTouchyType(type)) set_bit(screengrid,i,1);
and
Code:
if(!isTouchyType(type)) set_bit(ffcgrid, current_ffcombo, 1);
and they should become continuous again. screengrid and ffcgrid are used to keep track of which combos have already been checked for the current attack.