You can make a character do custom moves with the same inputs. Say hit_Fa:. You need to use itr: kind: 8 for this so that your weapon can detect whether there is a character there and then create a type 0 bdy: so there is another type 0 bdy: for the original character to activate the special attack. First, create an extra frame inside the weapon's data, with itr: kind: 8 and make it in an area that is far off in the y-axis (say y: 70000). Make this frame have a state: 3005, wait: 1 next: 1000. Now, in every on_hand frame, make it opoint: itself with the exact centerx/centery coordinates and have the action: be the frame number that has the itr: kind: 8. For the dvx: # value, make it go to a frame which will opoint: the original character on a frame with another far off bdy: area. You're done with the weapon data.

Make a frame with pic: 999 (so that no sprite will be drawn) and state: 3005 (for no shadow), wait: 1 next: 1000. This is the frame that the weapon opoint. You have to edit the character in one of his frames to have a bdy: at the area where the itr: kind: 8 is in the opoint:ed weapon's frame. This should be the frame just before your character does the special move. On this frame, make another itr: kind: 8 to bring your character to the special move frames. The following example I made shows how this technique is done. When Freeze holds a weapon and does a jump_weapon_atck, he will just swing the weapon normally, but if he holds his ice sword, he will spin around with it giving more attacking area.

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You have multiple choices here. First one is using dvy: 550. The value "550" is reserved to stop any kind of movement. dvx: 550 will stop your movement on the x-axis, dvy: 550 stops it on the y-axis. If you're in the air, the dvy: 550 will keep you in the air at the same altitude. You can also read about this technique >here<
The harder method is Windmill's flying system. It creates some cool-looking hover-effect by using different dvy-values. LF2's gravity is exactly 1.7 - means, that you'll need to use different wait- and dvy-values to realize this effect. Read about this technique >here<