no bad idea for me. i think is not bad the idea to raise your shield. but, is annoying for really, gladiator have a lot of abilitys to use to gain enmity and whit the fact you have to raise your shield every 10-15-20 secs dont let the gladis any window to autoaatack and gain tp. my almost only tp resource is for bloking whit outmaneaver. i encourage you to increse the second the shield is rise. or make it autoblock is not a bad idea too.

btw, the ability Ambidextery is wirhtless whit a scutum shield.