Couple of suggestions.
When this happens, and you are able to wiggle it loose to operate again, FIX IT. Otherwise it will stick when you least want it to.... Usually they stick in off, or lock, and you can't turn it to on to remove the lock core.... And the fix then is to drill out the lock core, a very messy annoying job.
Sometimes, just spraying a good amount of WD 40 into the keyway will help. Spray graphite is also said to help.
Usually, this is the pins in the lock getting worn and dry, and sticking, or the key getting worn so it does'nt move the pins all the way, so the WD40 will help for awhile. A new lock core will usually help. I would not tape or defeat the key release. I suppose you could remove it.
On most Mustangs, you can also take the core out, and remove the lock pins, and reinstall the core. Then any Ford key that fits the keyway will operate the car. Not very secure, but it wont jam anymore. Do not ask why I know this.... On new ones there are flat metal sliders, vice old school pins, and this is a bit harder. But if you have a chip key, it may be the trick again.
The key cylinder has a tab on the end that fits in the pinion and turns it to move the rack that moves the rod that actually moves the switch. On tilt columns it has to operate at all angles of the wheel, and can get sticky at extremes.
You should be able to remove the plastic covers and lubricate the rack and pinion assembly with grease.
Also, check that the ignition switch itself has not developed a sticky spot, perhaps, just change it.
This stuff is usually very reliable, so if you get it working it should keep going for awhile. The lock in my 79 is original except for one core/cylinder change.
My 97 truck stuck in March, but WD40 seems to have fixed it....
