It should be possible to expire the passphrase on a key after a specified time, and also to load a key but defer requesting the passphrase until the key is first used. Perhaps it should be possible for Pageant to remember the keys it has loaded and automatically reload them on restart. If we do this, we should probably include a means of distinguishing that sort of error output from anything the remote site can possibly send. Of course Pageant would have to avoid offering these options if it couldn't find the PuTTY binary on startup. PuTTY should do something sensible if the user key it's given in the configuration matches one of the ones in Pageant.
Several people seem to want margins between the PuTTY window border and the terminal contents.
Configurable, of course. When selecting with the mouse, it might make sense for further incoming data to be buffered until the user lets go, so that they aren't trying to work with a moving target. This might also be nice when scrolling with the scrollbar. This change will take effect the next time your terminal is reset. A second font selection for 132-column mode.