If you are at full power, you're at full power, so pushing ain't gonna help
I suppose the theory is that you may have forgotten something, or pushing it may help (props, mixtures, throttles)
As far as coming in high in a single in case you have EF....I have just been browsing the AAIB website, and there are quite a few accidents caused by steep approaches, people mucking it up, landing too long, ballooning and stacking it into the hedge at the end or the runway....just a word of caution
I'm a firm believer in a nice stabilised approach on the PAPI, VASI, GS or whatever
Cheers
EA