I'd counter your argument by stating that the gestures should actually be of some use:
[b]Up[/b]: "Wave" invites target to your fire team
[b]Down[/b]: "Sit" sets your status as 'away' (displays a BRB icon next to your name) sending automatic replies to game invites that you are away.
[b]Left[/b]: "Point" sets a rally point visible to members of your fire team, using your emblem to distinguish who placed which rally point (can also be used on a target to call out priority targets for focus fire or on an ally to destinate as the point man/woman).
[b]Right[/b]: "Dance" sets your status as 'looking for group' (displays an LFG icon next to your name) if not presently in a fire team.
As for ammo Synthesis, the easy way to do this is simply while holding the empty weapon, if you have an appropriate ammo synthesis in your inventory, the reload button (Square on PS, "X" on XBox) will display on the screen with text "Use Synthesis" next to it. Holding down the button for 2-3 seconds would use the appropriate ammo consumable, and no fussing with menus would be involved.
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This!
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