The main issue with using non-standard plugins is if the creator stops maintaing the plugin.
Ashley tries not to make breaking changes, but it may sometimes be necessary. If the breaking change breaks the non-standard plugin, and the creator is no longer around, you could be well and truly stuck.
Basically, think carefully if you really need to use the extra plugins - many are just short-cuts to a series of events, and may be best not being used.
In the end though, it is entirely up to you, and some non-standard plugins - Canvas and Paster for example - are worth the risk, IMO.