I learnt this in another thread but for a lot of abilities (in my case Force Field) you can actually hold the hot key button (in this case F) and just spam clicks for force fields.. This works with a lot of other abilities as well. I find this a lot easier because it stopes your sentries from trying to chain forcefields after an A-move command. also holding F is a lot easier then F+click F+click F+click F+click etc..
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