Please, especially for multi-player, for the love of Spongebob, get rid of this painfully dumb system. We all know the scenarios:
"Getting overwhelmed, better move position."
*storms cover several times*
*dies*
or everyone's favourite
Announcer: "Squad mate down."
Me: "I'll save you!"
*Dives over dying squad mate*
*Has a little sit down next to squad mate against some cover*
*Activates the objective next to dying squad mate which cannot be cancelled without moving away again*
*rinse and repeat*
*Squadmate dies*
Manual dexterity has little to do with this, the contextual system just doesn't work well enough for a one button system.
I will cut the developers some slack.
Hand held controllers don't have many buttons. On the PS1/2/3/4 you have the 4 shoulder buttons, 4 d-pad buttons, 4 action buttons (X, Triangle, Circle, Square), using the analogue sticks as buttons, start and select. 16 buttons. Mass Effect games have so many functions that it's hard to fit them all onto one controller.
However on a keyboard plus a mouse there is no excuse. The alphabet alone has 26 keys. Then there are the numbers 0-9, then there are the function keys (my laptop has 12 of those) then there is the enter key, spacebar, shift key, plus the direction keys, plus a few others. Not to mention the right click and left click on the mouse (or touch pad).
Seriously. If console gamers like me have to put up with X doing most stuff that's forgiveable. 16 buttons is actually way too few. But the keyboard has more than double this. Spacebar doesn't have to do everything.