Sounds more like the operators need to instil some basic rules regading airmanship.
Some simple rules like observing the signal square instructions or else would stop most of this stuff.
Upgrading the radio service is an option and these days oh so popular - but an expensive and probably for the majority of the time an unnecessary one.
Look at airfields that have truly high traffic rates - Kemble, Sun 'n Fun etc. A rigid set of rules and effectively no radio. It worked when aircraft didn't have radios and it still does.
Radio is a shambles might bring a bit of order - or it might just make it seem like there is some order.
Basic operational rules are the real requirement here!