Well i was playing around with picwins the other day, making a game, and tried to use transparent PNG's. Of course, this didnt work. I think it would greatly improve the uses of picwins if transparent PNG's were supported. and, indeed i think it would make picwins even better if there was a transparency parameter in the picwin commands.
/drawrect -ihnrfecda @ <color> [<transparency percentage>] <size> <x y w h> [<x y w h>...]
(-a is transparency switch)
/drawrect -fa @test 4 50 2 0 0 50 50
This would draw a filled red square 50px by 50px in window @test at point 0 0 with 50% transparency and size 2.
/drawtext -a @test 6 70 arial 12 0 0 This is some transparent text!
This would write This is some transparent text! in purple at 0 0 on window @test with 70% transparency and in arial size 12.
I think this could make picwins much more useable, since u could layer images etc. you could create realistic light and such.
Transparent PNG's are used alot now in the graphics world, and making mirc support them would also greatly improve the usage of picwins.