A lock is an option indeed. I am also used to a touch screen, only I use a tablet instead of a phone. Even with 14k+ leadership I can manage to tap on a troop very fast, only problem you face is that probably you won’t see a lot any more by the constant need of tapping. I would experience a lock as a not so handy feature.
I sometimes deliberately wait with spawning troops, I want a bunch of troops to be summoned at once. Better to get a close pack of troops and then spawn troop instead of auto summon them.
Say this lock feature is added plus activated so you automatically spawn knights as soon as the morale is ready. The knights pop out one by one and run forward in a line, run towards the choke point where a bunch of storm cannons is waiting for them. With this auto option on, you can say goodbye to all your spawned knights. When you wait instead and spawn them as a pack when enough morale is there, the cannons have many targets and I bet a lot of them will pass unharmed. Also, with auto spawn active and frosters at a choke point, no troops will ever arrive at the hero, unless it’s ranged troops who outshoot the frosters and other troops waiting for them, but even arbs summoned one by one will be killed that way. Timing and waiting make a big impact to the strategy and waiting a few seconds could mean the frosters move on and your knights pass the chokepoint safely.
As a Windows user I say, what I never got I won’t miss. You won’t hear me complain about other players getting a bunch of gems by using tapjoy, video for a free raid and so on. When I am really desperate and urgently need gems, I simply buy them, since I understand also that a business can’t live solely from air. Having said that, last year I didn’t spend a single dime on buying gems since I only spend them when required.