I don't do house rules unless it is absolutely necessary. The rules as written should always work - that is after all why we pay for them. If i didn't want to use rules as written I wouldn't have brought all the books and would write my own 40k rules. I am not against other people house ruling; that is upt to them. But I find it bizarre that people on one hand buy the books and are then quite happy to throw the contents out of the window.
Rules also need to be written as clearly and as concisely as possible. This is something that FFG has yet to master. They have great setting ideas and clearly the means to great production values (editing/playtesting aside). Unfortunalely they are not adept at presenting rules. If rules work in a way that seems counter intuitive to what they are trying to emulate or represent then there is a problem. The reason why suppressive fire requires an automatic weapon is precisely because of how I have described the tactic: you are laying down continuopus fire to an area to keep it suppressed. You can't do this with a single shot and the rules acknnowledge this. So therefore it is logical to assume this, as a full action, is what you are doing for the entire turn. If that is not the case then there is no penalty for attacking the suppressor and forcing him to dodge, it won't stop him suppressing the area in question because he has already stopped, as far as the rules are concerned.