just for fun, here's 3 position players who have made appearances on the mound
1) Tony Pena Jr. (Royals SS): velocity = 88-90 mph
. pitches: fastball, slider
2) Scott Spiezio (free agent utility player): velocity = 83-85 mph. pitches: fastball, slider
3) Aaron Miles (free agent 2B): velocity = 72-74 mph. pitches: fastball, curveball
on a more serious note, here are some fielding data for Orioles players.
1) Adam Jones played shortstop in the low minors - his fielding data (if that helps you make ratings at all) are 459 PO, 668 A, 66 E, 140 DP, .945 FP, 4.60 RFg. this is only if you care about making OF ratings for infielders and vice versa.
2) Oscar Salazar is listed on the MLB.com depth chart as the backup SS, so I think you should give him sufficient "experience" at that position.
3) Lou Montanez was also a shortstop in the low minors - his fielding data at SS are 206 PO, 334 A, 43 E, 64 DP, .926 FP, 4.03 RFg (he also played an equal amount of 2B if that matters)
4) Mike Costanzo was given time last season at catcher - I read an interview where he said he was legitimately being considered as an emergency catcher. maybe you should give him ratings for catcher ability and arm (or maybe not).