In the swat 2 directory open the 'swat2.ini.' file and add the heading '[Missions Played]' underneath type
sm1=1
sm2=1
sm3=1
sm4=1
sm5=1
sm6=1
sm7=1
sm8=1
sm9=1
sm10=1
sm11=1
sm12=1
sm13=1
sm14=1
sm15=1
tm16=1
tm17=1
tm18=1
tm19=1
tm20=1
tm21=1
tm22=1
tm23=1
tm24=1
tm25=1
tm26=1
tm27=1
tm28=1
tm29=1
tm30=1

Then save, and launch SWAT2. You will notice all the missions are now available under quick mission!