Just thinking that a collect mail now button would be a great feature, either a collect all where it manually runs a download for all accounts, or one for each pop account

Someone else has just made a similar suggestion. Also, a Suspend button to prevent any downloading while suspended. I will look at implementing both for the next release.

This facility is available in v1.2.0, which is now available for download. You can also suspend collection while configuring. I haven't added a Collect All... I'll add this option in the next release if I remember!